| Year | Count |
|---|---|
| 1974 | 7 |
| 1976 | 6 |
| 1978 | 5 |
| 1979 | 5 |
| 1981 | 14 |
| 1982 | 24 |
| 1983 | 21 |
| 1984 | 44 |
| 1986 | 30 |
| 1987 | 46 |
| 1988 | 47 |
| 1989 | 37 |
| 1990 | 57 |
| 1991 | 60 |
| 1992 | 92 |
| 1993 | 74 |
| 1994 | 64 |
| 1995 | 49 |
| 1996 | 63 |
| 1997 | 50 |
| 1998 | 55 |
| 1999 | 73 |
| 2000 | 51 |
| 2001 | 66 |
| 2002 | 38 |
| 2003 | 59 |
| 2004 | 48 |
| 2005 | 47 |
| 2006 | 33 |
| 2007 | 37 |
| 2008 | 46 |
| 2009 | 30 |
| 2010 | 33 |
| 2011 | 25 |
| 2012 | 22 |
| 2013 | 16 |
| 2014 | 14 |
| 2015 | 19 |
| 2016 | 26 |
| 2017 | 16 |
| 2018 | 14 |
| 2019 | 7 |
| 2020 | 8 |
| 2021 | 5 |
| 2023 | 5 |