| Year | Count |
|---|---|
| 1983 | 5 |
| 1984 | 5 |
| 1985 | 20 |
| 1986 | 47 |
| 1987 | 131 |
| 1988 | 129 |
| 1989 | 171 |
| 1990 | 205 |
| 1991 | 228 |
| 1992 | 204 |
| 1993 | 206 |
| 1994 | 197 |
| 1995 | 228 |
| 1996 | 329 |
| 1997 | 330 |
| 1998 | 264 |
| 1999 | 244 |
| 2000 | 194 |
| 2001 | 221 |
| 2002 | 126 |
| 2003 | 158 |
| 2004 | 157 |
| 2005 | 136 |
| 2006 | 127 |
| 2007 | 103 |
| 2008 | 84 |
| 2009 | 31 |
| 2010 | 30 |
| 2011 | 31 |
| 2014 | 5 |
| 2016 | 15 |
| 2023 | 6 |