| Year | Count |
|---|---|
| 1978 | 5 |
| 1983 | 5 |
| 1984 | 5 |
| 1985 | 26 |
| 1986 | 11 |
| 1987 | 40 |
| 1988 | 38 |
| 1989 | 72 |
| 1990 | 50 |
| 1991 | 91 |
| 1992 | 107 |
| 1993 | 114 |
| 1994 | 91 |
| 1995 | 66 |
| 1996 | 76 |
| 1997 | 91 |
| 1998 | 104 |
| 1999 | 80 |
| 2000 | 10 |
| 2001 | 5 |
| 2002 | 10 |
| 2003 | 20 |
| 2004 | 28 |
| 2005 | 10 |
| 2006 | 30 |
| 2007 | 8 |
| 2008 | 16 |
| 2009 | 5 |
| 2010 | 8 |
| 2011 | 13 |
| 2012 | 14 |
| 2015 | 15 |
| 2018 | 16 |
| 2019 | 8 |
| 2024 | 8 |