| Year | Count |
|---|---|
| 1982 | 24 |
| 1983 | 48 |
| 1984 | 228 |
| 1985 | 365 |
| 1986 | 174 |
| 1987 | 158 |
| 1988 | 172 |
| 1989 | 174 |
| 1990 | 289 |
| 1991 | 261 |
| 1992 | 302 |
| 1993 | 157 |
| 1994 | 95 |
| 1995 | 24 |
| 1996 | 103 |
| 1997 | 58 |
| 1998 | 30 |
| 1999 | 47 |
| 2000 | 24 |
| 2001 | 37 |
| 2002 | 36 |
| 2003 | 50 |
| 2004 | 30 |
| 2005 | 66 |
| 2006 | 82 |
| 2007 | 81 |
| 2008 | 93 |
| 2009 | 57 |
| 2010 | 67 |
| 2011 | 36 |
| 2012 | 46 |
| 2013 | 39 |
| 2014 | 25 |
| 2015 | 24 |
| 2016 | 28 |
| 2017 | 26 |
| 2018 | 12 |
| 2020 | 12 |