| Year | Count |
|---|---|
| 1983 | 8 |
| 1985 | 13 |
| 1986 | 5 |
| 1987 | 16 |
| 1988 | 6 |
| 1989 | 21 |
| 1990 | 57 |
| 1991 | 48 |
| 1992 | 74 |
| 1993 | 88 |
| 1994 | 110 |
| 1995 | 126 |
| 1996 | 160 |
| 1997 | 156 |
| 1998 | 229 |
| 1999 | 208 |
| 2000 | 184 |
| 2001 | 313 |
| 2002 | 248 |
| 2003 | 190 |
| 2004 | 169 |
| 2005 | 344 |
| 2006 | 808 |
| 2007 | 649 |
| 2008 | 714 |
| 2009 | 701 |
| 2010 | 644 |
| 2011 | 571 |
| 2012 | 568 |
| 2013 | 610 |
| 2014 | 572 |
| 2015 | 528 |
| 2016 | 522 |
| 2017 | 403 |
| 2018 | 331 |
| 2019 | 402 |
| 2020 | 262 |
| 2021 | 357 |
| 2022 | 227 |
| 2023 | 200 |
| 2024 | 161 |