| Year | Count |
|---|---|
| 1997 | 5 |
| 1998 | 6 |
| 1999 | 7 |
| 2000 | 7 |
| 2001 | 42 |
| 2002 | 50 |
| 2003 | 91 |
| 2004 | 139 |
| 2005 | 215 |
| 2006 | 291 |
| 2007 | 366 |
| 2008 | 436 |
| 2009 | 436 |
| 2010 | 390 |
| 2011 | 427 |
| 2012 | 379 |
| 2013 | 376 |
| 2014 | 369 |
| 2015 | 412 |
| 2016 | 331 |
| 2017 | 431 |
| 2018 | 313 |
| 2019 | 311 |
| 2020 | 403 |
| 2021 | 357 |
| 2022 | 364 |
| 2023 | 427 |
| 2024 | 312 |