| Year | Count |
|---|---|
| 1985 | 5 |
| 1986 | 8 |
| 1987 | 22 |
| 1988 | 26 |
| 1989 | 35 |
| 1990 | 67 |
| 1991 | 51 |
| 1992 | 176 |
| 1993 | 168 |
| 1994 | 159 |
| 1995 | 140 |
| 1996 | 132 |
| 1997 | 182 |
| 1998 | 164 |
| 1999 | 150 |
| 2000 | 184 |
| 2001 | 216 |
| 2002 | 227 |
| 2003 | 181 |
| 2004 | 198 |
| 2005 | 165 |
| 2006 | 204 |
| 2007 | 98 |
| 2008 | 156 |
| 2009 | 99 |
| 2010 | 92 |
| 2011 | 72 |
| 2012 | 82 |
| 2013 | 72 |
| 2014 | 75 |
| 2015 | 22 |
| 2016 | 10 |
| 2017 | 6 |
| 2018 | 8 |
| 2019 | 10 |
| 2021 | 5 |
| 2023 | 12 |