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Vision-aided system for obtaining a required weight by efficient choice of irregular fragments
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Avila-Castro, Angel Ramon Hernández-Martínez, Miriam Estevez, Martha Cruz, Rodrigo Esparza, Ramiro Pérez, Angel Luis Rodríguez" "autores" => array:7 [ 0 => array:2 [ "nombre" => "Itzel A." 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The granular structure along with pores between the grains are present. The measured values of the grain size from the SEM images depict that it decreases continuously as the Ni content in TiO<span class="elsevierStyleInf">2</span> thin films is increased.</p>" ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Bushra Parveen, Mahmood-ul-Hassan, Zeeshan Khalid, Saira Riaz, Shahzad Naseem" "autores" => array:5 [ 0 => array:2 [ "nombre" => "Bushra" "apellidos" => "Parveen" ] 1 => array:1 [ "apellidos" => "Mahmood-ul-Hassan" ] 2 => array:2 [ "nombre" => "Zeeshan" "apellidos" => "Khalid" ] 3 => array:2 [ "nombre" => "Saira" "apellidos" => "Riaz" ] 4 => array:2 [ "nombre" => "Shahzad" "apellidos" => "Naseem" ] ] ] ] ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S166564231730024X?idApp=UINPBA00004N" "url" => "/16656423/0000001500000002/v1_201704200317/S166564231730024X/v1_201704200317/en/main.assets" ] "en" => array:20 [ "idiomaDefecto" => true "cabecera" => "<span class="elsevierStyleTextfn">Original</span>" "titulo" => "Vision-aided system for obtaining a required weight by efficient choice of irregular fragments" "tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "140" "paginaFinal" => "142" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "Francisco Sánchez Niño, Victor Hugo Compeán Jasso, Francisco Javier De Anda Salazar, Carlos Soubervielle Montalvo, Juan Carlos Muñoz" "autores" => array:5 [ 0 => array:4 [ "nombre" => "Francisco Sánchez" "apellidos" => "Niño" "email" => array:1 [ 0 => "ninof_sanf@yahoo.com.mx" ] "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">*</span>" "identificador" => "cor0005" ] ] ] 1 => array:3 [ "nombre" => "Victor Hugo Compeán" "apellidos" => "Jasso" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff0010" ] ] ] 2 => array:3 [ "nombre" => "Francisco Javier De Anda" "apellidos" => "Salazar" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] ] ] 3 => array:3 [ "nombre" => "Carlos Soubervielle" "apellidos" => "Montalvo" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">c</span>" "identificador" => "aff0015" ] ] ] 4 => array:3 [ "nombre" => "Juan Carlos" "apellidos" => "Muñoz" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">c</span>" "identificador" => "aff0015" ] ] ] ] "afiliaciones" => array:3 [ 0 => array:3 [ "entidad" => "Instituto de Investigación en Comunicación Óptica IICO-UASLP, San Luis Potosí, Mexico" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "CONACYT Research Fellow - Instituto de Investigación en Comunicación Óptica IICO-UASLP, San Luis Potosí, Mexico" "etiqueta" => "b" "identificador" => "aff0010" ] 2 => array:3 [ "entidad" => "Facultad de Ingeniería UASLP, San Luis Potosí, Mexico" "etiqueta" => "c" "identificador" => "aff0015" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig0005" "etiqueta" => "Fig. 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1331 "Ancho" => 1650 "Tamanyo" => 91370 ] ] "descripcion" => array:1 [ "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Block diagram of the weighing system.</p>" ] ] ] "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleLabel">1</span><span class="elsevierStyleSectionTitle" id="sect0015">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">The exact weighing of a required amount of certain materials can be a frustrating and tedious task if the material is given in irregular pieces of different weights and shapes. Such is the case in the preparation of experiments for the growth of semiconductor heterostructures using the liquid phase epitaxial (LPE) technique (<a class="elsevierStyleCrossRef" href="#bib0030">Mishournyi, Hernández, Gorbatchev, & Lastras, 2002</a>).</p><p id="par0010" class="elsevierStylePara elsevierViewall">In this kind of experiments each layer is grown from a specific multicomponent liquid solution. To prepare the solution with an exact composition, given by the phase diagrams, it is necessary to weigh each component with high accuracy.</p><p id="par0015" class="elsevierStylePara elsevierViewall">A further complication arises because a large number of pieces of each component increases the risk of losing one piece during the following steps of the growth experiment and so the maximum number of pieces allowed of each component of the solution is usually limited to 3–4.</p><p id="par0020" class="elsevierStylePara elsevierViewall">Normally this process is carried out by an operator that judiciously changes the weighed pieces according to his own experience until the required weight is reached.</p><p id="par0025" class="elsevierStylePara elsevierViewall">Since each liquid solution can have up to five components and normally several liquid solutions are required for one heterostructure, the weighing process can take several hours and thus it is prone to errors committed by the operator.</p><p id="par0030" class="elsevierStylePara elsevierViewall">To facilitate the weighing process, and to reduce the weighing time, a system has been built which consists of an analytic balance, a webcam and a PC (<a class="elsevierStyleCrossRef" href="#bib0025">Sánchez Niño, 2009</a>).</p><p id="par0035" class="elsevierStylePara elsevierViewall">To our knowledge there is no report in the literature about any other system built to accomplish this task.</p><p id="par0040" class="elsevierStylePara elsevierViewall">The system works in the following way: when the operator adds a piece to the analytic balance the PC reads its weight and takes a picture using the webcam. The image is processed to label the new piece and register its weight.</p><p id="par0045" class="elsevierStylePara elsevierViewall">Then the PC calculates the weight of each possible combination of the pieces in the analytic balance. If there is a combination of fragments that gives the required amount, the PC notifies the operator and indicates the pieces on its screen. If the correct weight cannot be achieved with any combination of pieces then the PC asks the operator to add another piece to the analytic balance (<a class="elsevierStyleCrossRef" href="#bib0005">Muñoz, 2013</a>).</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleLabel">2</span><span class="elsevierStyleSectionTitle" id="sect0020">System design</span><p id="par0050" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a> shows a block diagram of the weighing system; it can be divided into three sections as follows:</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleLabel">2.1</span><span class="elsevierStyleSectionTitle" id="sect0025">Weight acquisition</span><p id="par0055" class="elsevierStylePara elsevierViewall">The pieces of the material are weighed in an analytic balance with a resolution of 10<span class="elsevierStyleHsp" style=""></span>μg. The PC communicates with the analytic balance through an RS-232 port. A LabVIEW program was written to acquire the weight of each piece. The operator puts a new piece in the analytical balance pan and then clicks a button to start the weighing process, when the analytical balance, previously tared, has determined the piece's weight sends a “ready” signal to the PC which captures the result immediately.</p><p id="par0060" class="elsevierStylePara elsevierViewall">Then the PC sends a command to tare the analytical balance to prepare it to weigh a new piece.</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleLabel">2.2</span><span class="elsevierStyleSectionTitle" id="sect0030">Image acquisition and labeling</span><p id="par0065" class="elsevierStylePara elsevierViewall">When the PC receives the ready signal from the analytical balance, in addition to reading the piece's weight, it sends a signal to the webcam to acquire a photograph. To control the webcam and to process the images the LabVIEW IMAQdx tools are used (<a class="elsevierStyleCrossRef" href="#bib0010">National Instruments, 2003</a>).</p><p id="par0070" class="elsevierStylePara elsevierViewall">To identify each piece, the photograph containing all the pieces on the analytical balance pan is converted to a binary image and processed to identify each particle. Each piece is then labeled using its location in the image and its weight (<a class="elsevierStyleCrossRef" href="#bib0015">National Instruments, 2011a</a>).</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleLabel">2.3</span><span class="elsevierStyleSectionTitle" id="sect0035">Data processing</span><p id="par0075" class="elsevierStylePara elsevierViewall">After a new piece has been weighed and labeled the PC calculates the weight of all the possible combinations of the pieces on the analytical balance pan (<a class="elsevierStyleCrossRef" href="#bib0020">National Instruments, 2011b</a>), if one of the combinations has the required weight, within the admissible error, the PC notifies the operator and points to the pieces that form that combination by blinking their images and changing the color of its corresponding number as shown in <a class="elsevierStyleCrossRef" href="#fig0010">Fig. 2</a>.</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0080" class="elsevierStylePara elsevierViewall">At the beginning of the process the operator defines the admissible error and the maximum number of fragments that can be selected to achieve the required weight.</p></span></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleLabel">3</span><span class="elsevierStyleSectionTitle" id="sect0040">Results and conclusion</span><p id="par0085" class="elsevierStylePara elsevierViewall">The system is routinely used to weigh the components of the solutions used in the LPE experiments. The weighing time has been dramatically reduced from several hours to a few minutes.</p><p id="par0090" class="elsevierStylePara elsevierViewall">The weighing time depends mainly on the number of pieces that have to be weighed to obtain the required weight and also on the time the operator takes to put a new piece on the analytical balance pan.</p><p id="par0095" class="elsevierStylePara elsevierViewall">The number of pieces that have to be weighed to obtain the required combination is random, but generally this number increases if the admissible error is reduced and if the maximum number of pieces allowed on a combination is decreased.</p><p id="par0100" class="elsevierStylePara elsevierViewall">The semi-automated procedure still depends, but to a lesser extent, on the practice of the operator to select the pieces to be weighed.</p><p id="par0105" class="elsevierStylePara elsevierViewall">Also it is necessary to be careful not to put the pieces together touching one another because the image labeling program fails in this case.</p><p id="par0110" class="elsevierStylePara elsevierViewall">The illumination has proved to be very important for the image processing task.</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Conflict of interest</span><p id="par0125" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:8 [ 0 => array:3 [ "identificador" => "xres830658" "titulo" => "Abstract" "secciones" => array:1 [ 0 => array:1 [ "identificador" => "abst0005" ] ] ] 1 => array:2 [ "identificador" => "xpalclavsec826653" "titulo" => "Keywords" ] 2 => array:2 [ "identificador" => "sec0005" "titulo" => "Introduction" ] 3 => array:3 [ "identificador" => "sec0010" "titulo" => "System design" "secciones" => array:3 [ 0 => array:2 [ "identificador" => "sec0015" "titulo" => "Weight acquisition" ] 1 => array:2 [ "identificador" => "sec0020" "titulo" => "Image acquisition and labeling" ] 2 => array:2 [ "identificador" => "sec0025" "titulo" => "Data processing" ] ] ] 4 => array:2 [ "identificador" => "sec0030" "titulo" => "Results and conclusion" ] 5 => array:2 [ "identificador" => "sec0035" "titulo" => "Conflict of interest" ] 6 => array:2 [ "identificador" => "xack278773" "titulo" => "Acknowledgments" ] 7 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2016-06-27" "fechaAceptado" => "2017-01-23" "PalabrasClave" => array:1 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Keywords" "identificador" => "xpalclavsec826653" "palabras" => array:5 [ 0 => "Arrays" 1 => "Data acquisition" 2 => "Data visualization" 3 => "Image recognition" 4 => "Machine vision" ] ] ] ] "tieneResumen" => true "resumen" => array:1 [ "en" => array:2 [ "titulo" => "Abstract" "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">There are some situations when it is necessary to weigh, with high accuracy and high precision, a required amount of material using heterogeneous and irregular pieces. As an example, in the laboratory, when preparing a liquid phase epitaxial growth, each of the materials that constitute the liquid phase must have an exact weight, within micrograms, given by the phase diagrams. The sources of the materials usually are small polycrystalline pieces of irregular shapes and random weights. Normally the weighing is done by interchanging the small irregular pieces of different sizes according to the criteria of the operator until the given weight is obtained. This is a long and tedious process and since each liquid solution requires several components, and a different liquid phase is needed for each layer, very often weighing it takes several hours. This operative process is prone to errors. To ease this kind of processes, a vision-assisted system has been developed. It consists of a webcam, an analytical balance and a PC. To use this assembly the operator only needs to put sequentially the pieces of the material in the analytical balance. When the required weight can be obtained by a combination of some of the pieces added to the analytic balance, the PC notifies the operator and signals the selected pieces in the screen. With the help of this system, the weighing accuracy has been improved and the time required to accomplish the process has been dramatically reduced.</p></span>" ] ] "NotaPie" => array:1 [ 0 => array:1 [ "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Peer Review under the responsibility of Universidad Nacional Autónoma de México.</p>" ] ] "multimedia" => array:2 [ 0 => array:7 [ "identificador" => "fig0005" "etiqueta" => "Fig. 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1331 "Ancho" => 1650 "Tamanyo" => 91370 ] ] "descripcion" => array:1 [ "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Block diagram of the weighing system.</p>" ] ] 1 => array:7 [ "identificador" => "fig0010" "etiqueta" => "Fig. 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 787 "Ancho" => 990 "Tamanyo" => 64063 ] ] "descripcion" => array:1 [ "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Example of the output image on the PC screen when the weighing process has succeeded.</p>" ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:6 [ 0 => array:3 [ "identificador" => "bib0030" "etiqueta" => "Mishournyi et al., 2002" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Tecnologías epitaxiales de crecimiento de cristales semiconductores" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:4 [ 0 => "V.A. Mishournyi" 1 => "I.C. Hernández" 2 => "A.Y. Gorbatchev" 3 => "A. Lastras" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Revista" => array:6 [ "tituloSerie" => "Avance y Perspectiva" "fecha" => "2002" "volumen" => "21" "numero" => "1" "paginaInicial" => "21" "paginaFinal" => "31" ] ] ] ] ] ] 1 => array:3 [ "identificador" => "bib0005" "etiqueta" => "Muñoz, 2013" "referencia" => array:1 [ 0 => array:3 [ "comentario" => "Tesis de Maestría" "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Sistema de pesaje de alta precisión para fragmentos irregulares apoyado en procesamiento de imagen" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "J.C. Muñoz" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Libro" => array:3 [ "fecha" => "2013" "editorial" => "Facultad de Ingeniería. Universidad Autónoma de San Luis Potosí (UASLP)" "editorialLocalizacion" => "México" ] ] ] ] ] ] 2 => array:3 [ "identificador" => "bib0010" "etiqueta" => "National Instruments, 2003" "referencia" => array:1 [ 0 => array:3 [ "comentario" => "[April 10, 2015], Retrieved from <span class="elsevierStyleInterRef" id="intr0005" href="http://www.ni.com/pdf/manuals/322916b.pdf">http://www.ni.com/pdf/manuals/322916b.pdf</span>" "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "IMAQ Vision Concepts Manual" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "National Instruments" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Libro" => array:1 [ "fecha" => "2003" ] ] ] ] ] ] 3 => array:3 [ "identificador" => "bib0015" "etiqueta" => "National Instruments, 2011a" "referencia" => array:1 [ 0 => array:3 [ "comentario" => "Retrieved from <span class="elsevierStyleInterRef" id="intr0010" href="http://www.ni.com/pdf/manuals/372228m.pdf">http://www.ni.com/pdf/manuals/372228m.pdf</span>" "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "NI Vision Assistant Tutorial, [May 17, 2015]" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "National Instruments" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Libro" => array:1 [ "fecha" => "2011" ] ] ] ] ] ] 4 => array:3 [ "identificador" => "bib0020" "etiqueta" => "National Instruments, 2011b" "referencia" => array:1 [ 0 => array:3 [ "comentario" => "[June 12, 2015] Retrieved from <span class="elsevierStyleInterRef" id="intr0015" href="http://www.ni.com/pdf/manuals/373379h.pdf">http://www.ni.com/pdf/manuals/373379h.pdf</span>" "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "NI Vision Builder for Automated Inspection Tutorial" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "National Instruments" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Libro" => array:1 [ "fecha" => "2011" ] ] ] ] ] ] 5 => array:3 [ "identificador" => "bib0025" "etiqueta" => "Sánchez Niño, 2009" "referencia" => array:1 [ 0 => array:3 [ "comentario" => "Tesis de Maestría" "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Automatización del sistema de crecimiento de cristales por epitaxia en fase líquida." "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "F. Sánchez Niño" ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Libro" => array:3 [ "fecha" => "2009" "editorial" => "Facultad de Ciencias. Universidad Autónoma de San Luis Potosí (UASLP)" "editorialLocalizacion" => "México" ] ] ] ] ] ] ] ] ] ] "agradecimientos" => array:1 [ 0 => array:4 [ "identificador" => "xack278773" "titulo" => "Acknowledgments" "texto" => "<p id="par0115" class="elsevierStylePara elsevierViewall">This work has been done with partial support from CONACYT and UASLP.</p>" "vista" => "all" ] ] ] "idiomaDefecto" => "en" "url" => "/16656423/0000001500000002/v1_201704200317/S1665642317300172/v1_201704200317/en/main.assets" "Apartado" => array:4 [ "identificador" => "41800" "tipo" => "SECCION" "en" => array:2 [ "titulo" => "Articles" "idiomaDefecto" => true ] "idiomaDefecto" => "en" ] "PDF" => "https://static.elsevier.es/multimedia/16656423/0000001500000002/v1_201704200317/S1665642317300172/v1_201704200317/en/main.pdf?idApp=UINPBA00004N&text.app=https://www.elsevier.es/" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1665642317300172?idApp=UINPBA00004N" ]
| Year/Month | Html | Total | |
|---|---|---|---|
| 2024 October | 9 | 3 | 12 |
| 2024 September | 22 | 8 | 30 |
| 2024 August | 12 | 4 | 16 |
| 2024 July | 15 | 1 | 16 |
| 2024 June | 9 | 4 | 13 |
| 2024 May | 8 | 1 | 9 |
| 2024 April | 11 | 3 | 14 |
| 2024 March | 12 | 2 | 14 |
| 2024 February | 10 | 2 | 12 |
| 2024 January | 14 | 5 | 19 |
| 2023 December | 13 | 10 | 23 |
| 2023 November | 20 | 10 | 30 |
| 2023 October | 34 | 2 | 36 |
| 2023 September | 13 | 6 | 19 |
| 2023 August | 12 | 5 | 17 |
| 2023 July | 6 | 3 | 9 |
| 2023 June | 8 | 3 | 11 |
| 2023 May | 13 | 6 | 19 |
| 2023 April | 15 | 0 | 15 |
| 2023 March | 11 | 3 | 14 |
| 2023 February | 9 | 5 | 14 |
| 2023 January | 17 | 10 | 27 |
| 2022 December | 27 | 5 | 32 |
| 2022 November | 16 | 9 | 25 |
| 2022 October | 11 | 10 | 21 |
| 2022 September | 14 | 27 | 41 |
| 2022 August | 21 | 6 | 27 |
| 2022 July | 16 | 10 | 26 |
| 2022 June | 8 | 11 | 19 |
| 2022 May | 17 | 9 | 26 |
| 2022 April | 14 | 9 | 23 |
| 2022 March | 10 | 9 | 19 |
| 2022 February | 15 | 12 | 27 |
| 2022 January | 20 | 12 | 32 |
| 2021 December | 13 | 9 | 22 |
| 2021 November | 8 | 11 | 19 |
| 2021 October | 16 | 16 | 32 |
| 2021 September | 24 | 10 | 34 |
| 2021 August | 11 | 10 | 21 |
| 2021 July | 11 | 7 | 18 |
| 2021 June | 13 | 9 | 22 |
| 2021 May | 18 | 4 | 22 |
| 2021 April | 54 | 22 | 76 |
| 2021 March | 34 | 8 | 42 |
| 2021 February | 9 | 9 | 18 |
| 2021 January | 12 | 11 | 23 |
| 2020 December | 19 | 9 | 28 |
| 2020 November | 18 | 7 | 25 |
| 2020 October | 16 | 5 | 21 |
| 2020 September | 15 | 9 | 24 |
| 2020 August | 14 | 9 | 23 |
| 2020 July | 11 | 10 | 21 |
| 2020 June | 5 | 6 | 11 |
| 2020 May | 11 | 8 | 19 |
| 2020 April | 8 | 2 | 10 |
| 2020 March | 4 | 4 | 8 |
| 2020 February | 9 | 3 | 12 |
| 2020 January | 8 | 2 | 10 |
| 2019 December | 14 | 9 | 23 |
| 2019 November | 7 | 2 | 9 |
| 2019 October | 11 | 4 | 15 |
| 2019 September | 9 | 2 | 11 |
| 2019 August | 4 | 2 | 6 |
| 2019 July | 15 | 10 | 25 |
| 2019 June | 29 | 15 | 44 |
| 2019 May | 59 | 40 | 99 |
| 2019 April | 7 | 10 | 17 |
| 2019 March | 4 | 6 | 10 |
| 2019 February | 4 | 3 | 7 |
| 2019 January | 2 | 2 | 4 |
| 2018 December | 0 | 1 | 1 |
| 2018 November | 2 | 1 | 3 |
| 2018 October | 4 | 9 | 13 |
| 2018 September | 4 | 6 | 10 |
| 2018 August | 3 | 1 | 4 |
| 2018 July | 3 | 1 | 4 |
| 2018 June | 3 | 1 | 4 |
| 2018 May | 6 | 1 | 7 |
| 2018 April | 2 | 0 | 2 |
| 2018 March | 7 | 0 | 7 |
| 2018 February | 0 | 1 | 1 |
| 2018 January | 5 | 0 | 5 |
| 2017 December | 5 | 0 | 5 |
| 2017 November | 6 | 0 | 6 |
| 2017 October | 6 | 4 | 10 |
| 2017 September | 2 | 5 | 7 |
| 2017 August | 18 | 3 | 21 |
| 2017 July | 17 | 1 | 18 |
| 2017 June | 21 | 9 | 30 |
| 2017 May | 22 | 10 | 32 |
| 2017 April | 17 | 1 | 18 |
| 2017 March | 2 | 4 | 6 |
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