| Year | Count |
|---|---|
| 1972 | 27 |
| 1973 | 26 |
| 1974 | 18 |
| 1975 | 27 |
| 1976 | 40 |
| 1977 | 36 |
| 1978 | 54 |
| 1979 | 44 |
| 1980 | 27 |
| 1981 | 7 |
| 1982 | 47 |
| 1983 | 41 |
| 1984 | 28 |
| 1985 | 22 |
| 1986 | 14 |
| 1987 | 22 |
| 1988 | 46 |
| 1989 | 50 |
| 1990 | 37 |
| 1991 | 46 |
| 1992 | 65 |
| 1993 | 36 |
| 1994 | 46 |
| 1995 | 45 |
| 1996 | 44 |
| 1997 | 71 |
| 1998 | 79 |
| 1999 | 101 |
| 2000 | 83 |
| 2001 | 111 |
| 2002 | 41 |
| 2003 | 67 |
| 2004 | 68 |
| 2005 | 75 |
| 2006 | 89 |
| 2007 | 95 |
| 2008 | 112 |
| 2009 | 62 |
| 2010 | 74 |
| 2011 | 85 |
| 2012 | 94 |
| 2013 | 97 |
| 2014 | 113 |
| 2015 | 102 |
| 2016 | 158 |
| 2017 | 161 |
| 2018 | 131 |
| 2019 | 122 |
| 2020 | 116 |
| 2021 | 111 |
| 2022 | 118 |
| 2023 | 118 |
| 2024 | 132 |