| Year | Count |
|---|---|
| 1997 | 8 |
| 1998 | 12 |
| 1999 | 24 |
| 2000 | 30 |
| 2001 | 36 |
| 2002 | 56 |
| 2003 | 55 |
| 2004 | 132 |
| 2005 | 193 |
| 2006 | 198 |
| 2007 | 210 |
| 2008 | 252 |
| 2009 | 388 |
| 2010 | 492 |
| 2011 | 668 |
| 2012 | 791 |
| 2013 | 685 |
| 2014 | 824 |
| 2015 | 1,000 |
| 2016 | 1,221 |
| 2017 | 1,293 |
| 2018 | 1,105 |
| 2019 | 987 |
| 2020 | 1,008 |
| 2021 | 932 |
| 2022 | 844 |
| 2023 | 792 |
| 2024 | 629 |