| Year | Count |
|---|---|
| 1974 | 6 |
| 1976 | 5 |
| 1978 | 5 |
| 1980 | 6 |
| 1988 | 5 |
| 1991 | 6 |
| 1992 | 15 |
| 1993 | 6 |
| 1994 | 7 |
| 1995 | 16 |
| 1996 | 11 |
| 1997 | 8 |
| 1998 | 18 |
| 1999 | 30 |
| 2000 | 6 |
| 2000 | 32 |
| 2001 | 28 |
| 2002 | 33 |
| 2003 | 26 |
| 2004 | 30 |
| 2005 | 40 |
| 2006 | 36 |
| 2007 | 44 |
| 2008 | 40 |
| 2009 | 42 |
| 2010 | 43 |
| 2011 | 41 |
| 2012 | 64 |
| 2013 | 77 |
| 2014 | 95 |
| 2015 | 114 |
| 2016 | 15 |
| 2016 | 244 |
| 2017 | 206 |
| 2018 | 238 |
| 2019 | 250 |
| 2020 | 120 |
| 2021 | 113 |
| 2022 | 104 |
| 2023 | 93 |
| 2024 | 96 |