| Year | Count |
|---|---|
| 1984 | 10 |
| 1985 | 6 |
| 1986 | 6 |
| 1987 | 5 |
| 1988 | 26 |
| 1989 | 6 |
| 1990 | 28 |
| 1991 | 40 |
| 1992 | 13 |
| 1993 | 10 |
| 1994 | 5 |
| 1997 | 6 |
| 1999 | 6 |
| 2005 | 5 |
| 2006 | 21 |
| 2007 | 55 |
| 2008 | 92 |
| 2009 | 100 |
| 2010 | 136 |
| 2011 | 151 |
| 2012 | 343 |
| 2013 | 455 |
| 2014 | 635 |
| 2015 | 995 |
| 2016 | 1,126 |
| 2017 | 1,091 |
| 2018 | 1,089 |
| 2019 | 1,070 |
| 2020 | 840 |
| 2021 | 918 |
| 2022 | 798 |
| 2023 | 620 |
| 2024 | 523 |