| Year | Count |
|---|---|
| 1996 | 6 |
| 1997 | 25 |
| 1998 | 69 |
| 1999 | 107 |
| 2000 | 177 |
| 2001 | 211 |
| 2002 | 165 |
| 2003 | 276 |
| 2004 | 372 |
| 2005 | 441 |
| 2006 | 494 |
| 2007 | 520 |
| 2008 | 513 |
| 2009 | 465 |
| 2010 | 502 |
| 2011 | 474 |
| 2012 | 619 |
| 2013 | 530 |
| 2014 | 505 |
| 2015 | 413 |
| 2016 | 308 |
| 2017 | 296 |
| 2018 | 139 |
| 2019 | 163 |
| 2020 | 137 |
| 2021 | 71 |
| 2022 | 75 |
| 2023 | 46 |
| 2024 | 26 |