| Year | Count |
|---|---|
| 1978 | 10 |
| 1979 | 11 |
| 1980 | 10 |
| 1981 | 23 |
| 1982 | 47 |
| 1983 | 28 |
| 1984 | 30 |
| 1985 | 40 |
| 1986 | 30 |
| 1987 | 56 |
| 1988 | 28 |
| 1989 | 53 |
| 1990 | 83 |
| 1991 | 68 |
| 1992 | 121 |
| 1993 | 119 |
| 1994 | 94 |
| 1995 | 71 |
| 1996 | 51 |
| 1997 | 31 |
| 1998 | 45 |
| 1999 | 31 |
| 2000 | 68 |
| 2001 | 33 |
| 2002 | 18 |
| 2003 | 33 |
| 2004 | 75 |
| 2005 | 53 |
| 2005 | 14 |
| 2006 | 33 |
| 2007 | 11 |
| 2007 | 12 |
| 2008 | 7 |
| 2009 | 12 |
| 2011 | 6 |
| 2019 | 5 |
| 2024 | 6 |