| Year | Count |
|---|---|
| 1976 | 32 |
| 1977 | 115 |
| 1978 | 99 |
| 1979 | 103 |
| 1980 | 60 |
| 1981 | 28 |
| 1982 | 60 |
| 1983 | 46 |
| 1984 | 34 |
| 1985 | 50 |
| 1987 | 17 |
| 1988 | 15 |
| 1989 | 16 |
| 1990 | 15 |
| 1991 | 63 |
| 1992 | 92 |
| 1993 | 56 |
| 1994 | 42 |
| 1995 | 45 |
| 1996 | 32 |
| 1997 | 24 |
| 1998 | 27 |
| 1999 | 6 |
| 2000 | 44 |
| 2001 | 42 |
| 2002 | 21 |
| 2003 | 31 |
| 2004 | 20 |
| 2005 | 24 |
| 2006 | 57 |
| 2007 | 29 |
| 2008 | 20 |
| 2009 | 10 |
| 2015 | 5 |
| 2016 | 26 |
| 2017 | 26 |
| 2019 | 5 |
| 2022 | 11 |
| 2023 | 10 |