| Year | Count |
|---|---|
| 1974 | 17 |
| 1975 | 17 |
| 1976 | 28 |
| 1977 | 71 |
| 1978 | 80 |
| 1979 | 72 |
| 1980 | 37 |
| 1981 | 30 |
| 1982 | 34 |
| 1983 | 29 |
| 1984 | 16 |
| 1985 | 14 |
| 1986 | 31 |
| 1987 | 34 |
| 1988 | 26 |
| 1989 | 37 |
| 1990 | 17 |
| 1991 | 75 |
| 1992 | 56 |
| 1993 | 97 |
| 1994 | 43 |
| 1995 | 53 |
| 1996 | 75 |
| 1997 | 87 |
| 1998 | 25 |
| 1999 | 26 |
| 2000 | 20 |
| 2001 | 6 |
| 2002 | 28 |
| 2003 | 19 |
| 2004 | 12 |
| 2005 | 32 |
| 2006 | 62 |
| 2007 | 7 |
| 2008 | 6 |
| 2009 | 10 |
| 2011 | 10 |
| 2014 | 12 |
| 2021 | 6 |
| 2022 | 6 |