| Year | Count |
|---|---|
| 1984 | 8 |
| 1986 | 5 |
| 1988 | 12 |
| 1989 | 53 |
| 1990 | 76 |
| 1991 | 97 |
| 1992 | 62 |
| 1993 | 87 |
| 1994 | 80 |
| 1995 | 69 |
| 1996 | 85 |
| 1997 | 119 |
| 1998 | 127 |
| 1999 | 146 |
| 2000 | 154 |
| 2001 | 92 |
| 2002 | 73 |
| 2003 | 52 |
| 2004 | 142 |
| 2005 | 133 |
| 2006 | 93 |
| 2007 | 66 |
| 2008 | 100 |
| 2009 | 50 |
| 2010 | 30 |
| 2011 | 44 |
| 2012 | 38 |
| 2014 | 14 |
| 2015 | 7 |
| 2016 | 6 |
| 2017 | 5 |
| 2019 | 5 |