| Year | Count |
|---|---|
| 1976 | 15 |
| 1984 | 10 |
| 1985 | 5 |
| 1987 | 6 |
| 1988 | 37 |
| 1989 | 32 |
| 1990 | 35 |
| 1991 | 62 |
| 1992 | 85 |
| 1993 | 69 |
| 1994 | 76 |
| 1995 | 109 |
| 1996 | 68 |
| 1997 | 90 |
| 1998 | 89 |
| 1999 | 92 |
| 2000 | 78 |
| 2001 | 55 |
| 2002 | 15 |
| 2003 | 18 |
| 2004 | 49 |
| 2005 | 40 |
| 2006 | 29 |
| 2007 | 41 |
| 2008 | 17 |
| 2010 | 25 |
| 2011 | 12 |
| 2012 | 10 |
| 2013 | 15 |
| 2014 | 22 |
| 2016 | 12 |
| 2019 | 5 |