| Year | Count |
|---|---|
| 1997 | 5 |
| 1998 | 12 |
| 1999 | 25 |
| 2000 | 28 |
| 2001 | 82 |
| 2002 | 78 |
| 2003 | 192 |
| 2004 | 300 |
| 2005 | 467 |
| 2006 | 459 |
| 2007 | 448 |
| 2008 | 557 |
| 2009 | 635 |
| 2010 | 644 |
| 2011 | 800 |
| 2012 | 760 |
| 2013 | 882 |
| 2014 | 954 |
| 2015 | 1,148 |
| 2016 | 1,126 |
| 2017 | 1,185 |
| 2018 | 1,125 |
| 2019 | 1,137 |
| 2020 | 1,085 |
| 2021 | 1,079 |
| 2022 | 982 |
| 2023 | 789 |
| 2024 | 812 |