| Year | Count |
|---|---|
| 1973 | 8 |
| 1974 | 8 |
| 1977 | 25 |
| 1978 | 28 |
| 1979 | 83 |
| 1980 | 129 |
| 1981 | 76 |
| 1982 | 56 |
| 1983 | 52 |
| 1984 | 75 |
| 1985 | 109 |
| 1986 | 102 |
| 1987 | 153 |
| 1988 | 175 |
| 1989 | 69 |
| 1990 | 82 |
| 1991 | 136 |
| 1992 | 160 |
| 1993 | 131 |
| 1994 | 110 |
| 1995 | 76 |
| 1996 | 103 |
| 1997 | 125 |
| 1998 | 100 |
| 1999 | 81 |
| 2000 | 82 |
| 2001 | 39 |
| 2002 | 45 |
| 2003 | 56 |
| 2004 | 93 |
| 2005 | 72 |
| 2006 | 94 |
| 2007 | 49 |
| 2008 | 97 |
| 2009 | 37 |
| 2010 | 18 |
| 2011 | 23 |
| 2012 | 8 |
| 2013 | 18 |
| 2014 | 23 |
| 2015 | 67 |
| 2016 | 67 |
| 2017 | 68 |
| 2018 | 47 |
| 2019 | 23 |
| 2020 | 56 |
| 2021 | 33 |
| 2022 | 23 |
| 2023 | 103 |
| 2024 | 169 |