| Year | Count |
|---|---|
| 1996 | 6 |
| 1997 | 8 |
| 1998 | 21 |
| 1999 | 49 |
| 2000 | 67 |
| 2001 | 134 |
| 2002 | 103 |
| 2003 | 150 |
| 2004 | 232 |
| 2005 | 325 |
| 2006 | 337 |
| 2007 | 560 |
| 2008 | 641 |
| 2009 | 488 |
| 2010 | 521 |
| 2011 | 582 |
| 2012 | 582 |
| 2013 | 434 |
| 2014 | 454 |
| 2015 | 495 |
| 2016 | 478 |
| 2017 | 406 |
| 2018 | 272 |
| 2019 | 245 |
| 2020 | 232 |
| 2021 | 215 |
| 2022 | 171 |
| 2023 | 108 |
| 2024 | 89 |