| Year | Count |
|---|---|
| 1992 | 5 |
| 1994 | 13 |
| 1995 | 51 |
| 1996 | 96 |
| 1997 | 147 |
| 1998 | 189 |
| 1999 | 262 |
| 2000 | 305 |
| 2001 | 448 |
| 2002 | 422 |
| 2003 | 454 |
| 2004 | 659 |
| 2005 | 670 |
| 2006 | 688 |
| 2007 | 650 |
| 2008 | 580 |
| 2009 | 516 |
| 2010 | 593 |
| 2011 | 576 |
| 2012 | 644 |
| 2013 | 427 |
| 2014 | 365 |
| 2015 | 435 |
| 2016 | 296 |
| 2017 | 369 |
| 2018 | 307 |
| 2019 | 275 |
| 2020 | 246 |
| 2021 | 236 |
| 2022 | 188 |
| 2023 | 161 |
| 2024 | 136 |