| Year | Count |
|---|---|
| 1986 | 26 |
| 1988 | 33 |
| 1989 | 95 |
| 1990 | 21 |
| 1991 | 54 |
| 1992 | 93 |
| 1993 | 109 |
| 1994 | 69 |
| 1995 | 143 |
| 1996 | 138 |
| 1997 | 238 |
| 1998 | 364 |
| 1999 | 358 |
| 2000 | 470 |
| 2001 | 544 |
| 2002 | 713 |
| 2003 | 922 |
| 2004 | 1,143 |
| 2005 | 1,086 |
| 2006 | 1,219 |
| 2007 | 1,307 |
| 2008 | 1,347 |
| 2009 | 1,192 |
| 2010 | 1,297 |
| 2011 | 1,483 |
| 2012 | 1,383 |
| 2013 | 1,293 |
| 2014 | 1,109 |
| 2015 | 1,036 |
| 2016 | 785 |
| 2017 | 682 |
| 2018 | 451 |
| 2019 | 392 |
| 2020 | 350 |
| 2021 | 299 |
| 2022 | 216 |
| 2023 | 282 |
| 2024 | 278 |