| Year | Count |
|---|---|
| 1975 | 5 |
| 1979 | 16 |
| 1980 | 28 |
| 1981 | 13 |
| 1982 | 30 |
| 1983 | 26 |
| 1984 | 13 |
| 1985 | 44 |
| 1986 | 60 |
| 1987 | 51 |
| 1988 | 35 |
| 1989 | 56 |
| 1990 | 62 |
| 1991 | 79 |
| 1992 | 88 |
| 1993 | 104 |
| 1994 | 95 |
| 1995 | 94 |
| 1996 | 83 |
| 1997 | 110 |
| 1998 | 112 |
| 1999 | 113 |
| 2000 | 107 |
| 2001 | 100 |
| 2002 | 101 |
| 2003 | 88 |
| 2004 | 129 |
| 2005 | 195 |
| 2006 | 126 |
| 2007 | 112 |
| 2008 | 92 |
| 2009 | 70 |
| 2010 | 70 |
| 2011 | 41 |
| 2012 | 49 |
| 2013 | 26 |
| 2014 | 38 |
| 2015 | 24 |
| 2016 | 96 |
| 2017 | 81 |
| 2018 | 23 |
| 2019 | 44 |
| 2020 | 34 |
| 2021 | 32 |
| 2022 | 32 |
| 2023 | 24 |
| 2024 | 32 |