| Year | Count |
|---|---|
| 1967 | 5 |
| 1969 | 5 |
| 1970 | 5 |
| 1971 | 15 |
| 1973 | 5 |
| 1974 | 17 |
| 1976 | 6 |
| 1978 | 12 |
| 1980 | 10 |
| 1983 | 10 |
| 1984 | 10 |
| 1985 | 6 |
| 1988 | 5 |
| 1992 | 6 |
| 1993 | 12 |
| 1994 | 7 |
| 1995 | 9 |
| 1996 | 14 |
| 1997 | 9 |
| 2000 | 29 |
| 2001 | 25 |
| 2002 | 14 |
| 2003 | 41 |
| 2004 | 27 |
| 2005 | 36 |
| 2006 | 28 |
| 2007 | 86 |
| 2008 | 95 |
| 2009 | 58 |
| 2010 | 60 |
| 2011 | 21 |
| 2012 | 24 |
| 2013 | 10 |
| 2014 | 24 |
| 2015 | 12 |
| 2016 | 29 |
| 2017 | 6 |
| 2018 | 33 |
| 2019 | 14 |
| 2020 | 5 |
| 2022 | 24 |
| 2024 | 6 |