| Year | Count |
|---|---|
| 1982 | 5 |
| 1983 | 9 |
| 1984 | 8 |
| 1985 | 5 |
| 1986 | 8 |
| 1987 | 27 |
| 1988 | 23 |
| 1989 | 10 |
| 1990 | 27 |
| 1991 | 16 |
| 1992 | 6 |
| 1993 | 5 |
| 1994 | 97 |
| 1995 | 75 |
| 1996 | 84 |
| 1997 | 115 |
| 1998 | 110 |
| 1999 | 57 |
| 2000 | 85 |
| 2001 | 78 |
| 2002 | 90 |
| 2003 | 115 |
| 2004 | 116 |
| 2005 | 98 |
| 2006 | 79 |
| 2007 | 88 |
| 2008 | 78 |
| 2009 | 58 |
| 2010 | 62 |
| 2011 | 49 |
| 2012 | 22 |
| 2013 | 16 |
| 2014 | 27 |
| 2016 | 5 |
| 2020 | 16 |