| Year | Count |
|---|---|
| 1983 | 7 |
| 1985 | 13 |
| 1986 | 6 |
| 1987 | 6 |
| 1988 | 6 |
| 1989 | 11 |
| 1990 | 7 |
| 1991 | 10 |
| 1992 | 12 |
| 1993 | 12 |
| 1994 | 8 |
| 1995 | 9 |
| 1996 | 38 |
| 1997 | 8 |
| 1998 | 32 |
| 1999 | 26 |
| 2000 | 38 |
| 2001 | 46 |
| 2002 | 36 |
| 2003 | 21 |
| 2004 | 53 |
| 2005 | 69 |
| 2006 | 96 |
| 2007 | 120 |
| 2008 | 133 |
| 2009 | 178 |
| 2010 | 228 |
| 2011 | 220 |
| 2012 | 274 |
| 2013 | 293 |
| 2014 | 196 |
| 2015 | 265 |
| 2016 | 381 |
| 2017 | 375 |
| 2018 | 455 |
| 2019 | 611 |
| 2020 | 448 |
| 2021 | 506 |
| 2022 | 289 |
| 2023 | 331 |
| 2024 | 377 |