| Year | Count |
|---|---|
| 1974 | 9 |
| 1975 | 20 |
| 1976 | 39 |
| 1977 | 31 |
| 1978 | 50 |
| 1979 | 101 |
| 1980 | 84 |
| 1981 | 62 |
| 1982 | 65 |
| 1983 | 76 |
| 1984 | 82 |
| 1985 | 173 |
| 1986 | 129 |
| 1987 | 141 |
| 1988 | 166 |
| 1989 | 135 |
| 1990 | 164 |
| 1991 | 162 |
| 1992 | 109 |
| 1993 | 53 |
| 1994 | 122 |
| 1995 | 48 |
| 1996 | 58 |
| 1997 | 92 |
| 1998 | 56 |
| 1999 | 62 |
| 2000 | 44 |
| 2001 | 55 |
| 2002 | 15 |
| 2003 | 49 |
| 2004 | 105 |
| 2005 | 85 |
| 2006 | 72 |
| 2007 | 117 |
| 2008 | 110 |
| 2009 | 52 |
| 2010 | 81 |
| 2011 | 88 |
| 2012 | 76 |
| 2013 | 15 |
| 2014 | 35 |
| 2015 | 75 |
| 2016 | 75 |
| 2017 | 79 |
| 2018 | 80 |
| 2019 | 100 |
| 2020 | 61 |
| 2021 | 70 |
| 2022 | 79 |
| 2023 | 48 |
| 2024 | 98 |