| Year | Count |
|---|---|
| 1982 | 81 |
| 1983 | 143 |
| 1984 | 71 |
| 1985 | 103 |
| 1986 | 114 |
| 1987 | 111 |
| 1988 | 85 |
| 1989 | 81 |
| 1990 | 99 |
| 1991 | 96 |
| 1992 | 131 |
| 1993 | 43 |
| 1994 | 26 |
| 1995 | 43 |
| 1996 | 28 |
| 1997 | 26 |
| 1998 | 37 |
| 1999 | 34 |
| 2000 | 23 |
| 2001 | 5 |
| 2002 | 22 |
| 2003 | 10 |
| 2004 | 22 |
| 2005 | 25 |
| 2006 | 35 |
| 2008 | 24 |
| 2009 | 28 |
| 2010 | 23 |
| 2011 | 25 |
| 2012 | 18 |
| 2013 | 29 |
| 2014 | 10 |
| 2015 | 19 |
| 2016 | 14 |
| 2017 | 18 |
| 2018 | 10 |
| 2019 | 6 |
| 2020 | 10 |
| 2023 | 5 |