| Year | Count |
|---|---|
| 1997 | 16 |
| 1998 | 44 |
| 1999 | 32 |
| 2000 | 76 |
| 2001 | 90 |
| 2002 | 96 |
| 2003 | 170 |
| 2004 | 199 |
| 2005 | 225 |
| 2006 | 268 |
| 2007 | 427 |
| 2008 | 520 |
| 2009 | 560 |
| 2010 | 550 |
| 2011 | 599 |
| 2012 | 652 |
| 2013 | 634 |
| 2014 | 684 |
| 2015 | 787 |
| 2016 | 648 |
| 2017 | 645 |
| 2018 | 578 |
| 2019 | 601 |
| 2020 | 638 |
| 2021 | 647 |
| 2022 | 622 |
| 2023 | 427 |
| 2024 | 387 |