| Year | Count |
|---|---|
| 1982 | 9 |
| 1983 | 14 |
| 1984 | 18 |
| 1985 | 41 |
| 1986 | 49 |
| 1987 | 48 |
| 1988 | 91 |
| 1989 | 90 |
| 1990 | 112 |
| 1991 | 108 |
| 1992 | 119 |
| 1993 | 119 |
| 1994 | 127 |
| 1995 | 108 |
| 1996 | 122 |
| 1997 | 131 |
| 1998 | 156 |
| 1999 | 115 |
| 2000 | 146 |
| 2001 | 110 |
| 2002 | 119 |
| 2003 | 100 |
| 2004 | 105 |
| 2005 | 113 |
| 2006 | 96 |
| 2007 | 88 |
| 2008 | 79 |
| 2009 | 64 |
| 2010 | 55 |
| 2011 | 63 |
| 2012 | 59 |
| 2013 | 45 |
| 2014 | 39 |
| 2015 | 25 |
| 2016 | 63 |
| 2017 | 60 |
| 2018 | 21 |
| 2019 | 26 |
| 2020 | 14 |
| 2021 | 7 |
| 2022 | 16 |
| 2023 | 16 |