| Year | Count |
|---|---|
| 1986 | 11 |
| 1987 | 18 |
| 1988 | 44 |
| 1989 | 59 |
| 1990 | 56 |
| 1991 | 100 |
| 1992 | 124 |
| 1993 | 187 |
| 1994 | 222 |
| 1995 | 208 |
| 1996 | 322 |
| 1997 | 350 |
| 1998 | 374 |
| 1999 | 374 |
| 2000 | 407 |
| 2001 | 472 |
| 2002 | 389 |
| 2003 | 535 |
| 2004 | 635 |
| 2005 | 752 |
| 2006 | 749 |
| 2007 | 799 |
| 2008 | 798 |
| 2009 | 759 |
| 2010 | 722 |
| 2011 | 929 |
| 2012 | 771 |
| 2013 | 645 |
| 2014 | 589 |
| 2015 | 498 |
| 2016 | 364 |
| 2017 | 364 |
| 2018 | 240 |
| 2019 | 246 |
| 2020 | 153 |
| 2021 | 174 |
| 2022 | 143 |
| 2023 | 124 |
| 2024 | 107 |