| Year | Count |
|---|---|
| 1976 | 6 |
| 1994 | 10 |
| 1997 | 30 |
| 1998 | 19 |
| 1999 | 75 |
| 2000 | 46 |
| 2001 | 97 |
| 2002 | 82 |
| 2003 | 133 |
| 2004 | 141 |
| 2005 | 177 |
| 2006 | 184 |
| 2007 | 206 |
| 2008 | 258 |
| 2009 | 143 |
| 2010 | 175 |
| 2011 | 153 |
| 2012 | 148 |
| 2013 | 226 |
| 2014 | 359 |
| 2015 | 391 |
| 2016 | 387 |
| 2017 | 405 |
| 2018 | 244 |
| 2019 | 187 |
| 2020 | 206 |
| 2021 | 166 |
| 2022 | 197 |
| 2023 | 181 |
| 2024 | 99 |