| Year | Count |
|---|---|
| 1992 | 7 |
| 1994 | 10 |
| 1995 | 13 |
| 1996 | 13 |
| 1997 | 11 |
| 1998 | 21 |
| 1999 | 13 |
| 2000 | 19 |
| 2001 | 23 |
| 2002 | 20 |
| 2003 | 40 |
| 2004 | 48 |
| 2005 | 40 |
| 2006 | 86 |
| 2007 | 146 |
| 2008 | 213 |
| 2009 | 158 |
| 2010 | 187 |
| 2011 | 177 |
| 2012 | 168 |
| 2013 | 173 |
| 2014 | 170 |
| 2015 | 138 |
| 2016 | 246 |
| 2017 | 168 |
| 2018 | 258 |
| 2019 | 222 |
| 2020 | 83 |
| 2021 | 104 |
| 2022 | 82 |
| 2023 | 86 |
| 2024 | 81 |