| Year | Count |
|---|---|
| 1974 | 11 |
| 1977 | 5 |
| 1978 | 5 |
| 1979 | 11 |
| 1980 | 15 |
| 1981 | 7 |
| 1982 | 31 |
| 1984 | 21 |
| 1985 | 20 |
| 1986 | 11 |
| 1987 | 13 |
| 1988 | 6 |
| 1989 | 18 |
| 1990 | 14 |
| 1991 | 40 |
| 1992 | 10 |
| 1993 | 42 |
| 1994 | 21 |
| 1995 | 22 |
| 1996 | 22 |
| 1997 | 21 |
| 1998 | 29 |
| 1999 | 5 |
| 2000 | 46 |
| 2001 | 37 |
| 2002 | 48 |
| 2003 | 17 |
| 2004 | 59 |
| 2005 | 46 |
| 2006 | 40 |
| 2007 | 33 |
| 2008 | 44 |
| 2010 | 7 |
| 2011 | 5 |
| 2012 | 5 |
| 2013 | 5 |
| 2015 | 10 |
| 2018 | 6 |
| 2019 | 10 |
| 2020 | 5 |
| 2023 | 5 |