| Year | Count |
|---|---|
| 1988 | 10 |
| 1992 | 5 |
| 1996 | 9 |
| 1997 | 16 |
| 1998 | 30 |
| 1999 | 27 |
| 2000 | 37 |
| 2001 | 98 |
| 2002 | 178 |
| 2003 | 254 |
| 2004 | 842 |
| 2005 | 1,011 |
| 2006 | 668 |
| 2007 | 760 |
| 2008 | 842 |
| 2009 | 576 |
| 2010 | 730 |
| 2011 | 1,269 |
| 2012 | 1,316 |
| 2013 | 1,101 |
| 2014 | 1,434 |
| 2015 | 2,296 |
| 2016 | 2,445 |
| 2017 | 2,289 |
| 2018 | 2,159 |
| 2019 | 1,919 |
| 2020 | 1,764 |
| 2021 | 1,864 |
| 2022 | 1,813 |
| 2023 | 1,647 |
| 2024 | 1,512 |