| Year | Count |
|---|---|
| 1983 | 10 |
| 1986 | 19 |
| 1987 | 25 |
| 1988 | 49 |
| 1989 | 49 |
| 1990 | 64 |
| 1991 | 63 |
| 1992 | 121 |
| 1993 | 182 |
| 1994 | 162 |
| 1995 | 148 |
| 1996 | 213 |
| 1997 | 173 |
| 1998 | 264 |
| 1999 | 307 |
| 2000 | 222 |
| 2001 | 185 |
| 2002 | 132 |
| 2003 | 177 |
| 2004 | 216 |
| 2005 | 277 |
| 2006 | 285 |
| 2007 | 201 |
| 2008 | 259 |
| 2009 | 156 |
| 2010 | 169 |
| 2011 | 121 |
| 2012 | 66 |
| 2013 | 65 |
| 2014 | 33 |
| 2015 | 12 |
| 2016 | 30 |
| 2017 | 50 |
| 2018 | 12 |
| 2022 | 5 |