| Year | Count |
|---|---|
| 1976 | 5 |
| 1978 | 6 |
| 1979 | 17 |
| 1980 | 8 |
| 1982 | 8 |
| 1983 | 15 |
| 1984 | 9 |
| 1985 | 16 |
| 1986 | 24 |
| 1987 | 18 |
| 1988 | 9 |
| 1989 | 13 |
| 1990 | 45 |
| 1991 | 27 |
| 1992 | 76 |
| 1993 | 19 |
| 1994 | 53 |
| 1995 | 57 |
| 1996 | 92 |
| 1997 | 69 |
| 1998 | 102 |
| 1999 | 62 |
| 2000 | 59 |
| 2001 | 100 |
| 2002 | 42 |
| 2003 | 64 |
| 2004 | 122 |
| 2005 | 106 |
| 2006 | 63 |
| 2007 | 43 |
| 2008 | 115 |
| 2009 | 45 |
| 2010 | 33 |
| 2011 | 13 |
| 2013 | 5 |
| 2015 | 7 |
| 2016 | 5 |
| 2017 | 5 |
| 2019 | 8 |
| 2022 | 7 |
| 2023 | 7 |