| Year | Count |
|---|---|
| 1990 | 24 |
| 1993 | 24 |
| 1994 | 27 |
| 1995 | 39 |
| 1996 | 37 |
| 1997 | 68 |
| 1998 | 80 |
| 1999 | 138 |
| 2000 | 187 |
| 2001 | 302 |
| 2002 | 312 |
| 2003 | 505 |
| 2004 | 716 |
| 2005 | 610 |
| 2006 | 714 |
| 2007 | 669 |
| 2008 | 614 |
| 2009 | 575 |
| 2010 | 440 |
| 2011 | 406 |
| 2012 | 511 |
| 2013 | 414 |
| 2014 | 301 |
| 2015 | 347 |
| 2016 | 353 |
| 2017 | 338 |
| 2018 | 281 |
| 2019 | 289 |
| 2020 | 278 |
| 2021 | 324 |
| 2022 | 495 |
| 2023 | 461 |
| 2024 | 475 |