| Year | Count |
|---|---|
| 1997 | 11 |
| 1998 | 9 |
| 1999 | 14 |
| 2000 | 20 |
| 2001 | 32 |
| 2002 | 44 |
| 2003 | 73 |
| 2004 | 68 |
| 2005 | 133 |
| 2006 | 162 |
| 2007 | 204 |
| 2008 | 250 |
| 2009 | 283 |
| 2010 | 322 |
| 2011 | 364 |
| 2012 | 397 |
| 2013 | 331 |
| 2014 | 299 |
| 2015 | 299 |
| 2016 | 554 |
| 2017 | 496 |
| 2018 | 532 |
| 2019 | 390 |
| 2020 | 190 |
| 2021 | 179 |
| 2022 | 161 |
| 2023 | 155 |
| 2024 | 135 |