| Year | Count |
|---|---|
| 1976 | 5 |
| 1978 | 5 |
| 1983 | 6 |
| 1985 | 6 |
| 1986 | 5 |
| 1990 | 15 |
| 1991 | 7 |
| 1992 | 11 |
| 1994 | 6 |
| 1996 | 8 |
| 1997 | 15 |
| 1998 | 16 |
| 1999 | 21 |
| 2000 | 24 |
| 2001 | 26 |
| 2002 | 22 |
| 2003 | 23 |
| 2004 | 38 |
| 2005 | 23 |
| 2006 | 32 |
| 2007 | 33 |
| 2008 | 33 |
| 2009 | 44 |
| 2010 | 29 |
| 2011 | 36 |
| 2012 | 33 |
| 2013 | 37 |
| 2014 | 32 |
| 2015 | 43 |
| 2016 | 22 |
| 2017 | 24 |
| 2018 | 26 |
| 2019 | 63 |
| 2020 | 30 |
| 2021 | 41 |
| 2022 | 46 |
| 2023 | 25 |
| 2024 | 64 |