| Year | Count |
|---|---|
| 1991 | 30 |
| 1992 | 5 |
| 1994 | 23 |
| 1995 | 51 |
| 1996 | 174 |
| 1997 | 258 |
| 1998 | 282 |
| 1999 | 154 |
| 2000 | 282 |
| 2001 | 284 |
| 2002 | 287 |
| 2003 | 334 |
| 2004 | 452 |
| 2005 | 498 |
| 2006 | 590 |
| 2007 | 788 |
| 2008 | 878 |
| 2009 | 793 |
| 2010 | 696 |
| 2011 | 864 |
| 2012 | 880 |
| 2013 | 617 |
| 2014 | 553 |
| 2015 | 622 |
| 2016 | 611 |
| 2017 | 694 |
| 2018 | 623 |
| 2019 | 602 |
| 2020 | 488 |
| 2021 | 738 |
| 2022 | 614 |
| 2023 | 590 |
| 2024 | 505 |