| Year | Count |
|---|---|
| 1974 | 25 |
| 1975 | 12 |
| 1976 | 24 |
| 1977 | 26 |
| 1978 | 53 |
| 1979 | 47 |
| 1980 | 54 |
| 1981 | 55 |
| 1982 | 32 |
| 1983 | 41 |
| 1984 | 22 |
| 1985 | 54 |
| 1986 | 52 |
| 1987 | 53 |
| 1988 | 71 |
| 1989 | 54 |
| 1990 | 61 |
| 1991 | 91 |
| 1992 | 147 |
| 1993 | 87 |
| 1994 | 90 |
| 1995 | 134 |
| 1996 | 92 |
| 1997 | 140 |
| 1998 | 123 |
| 1999 | 152 |
| 2000 | 232 |
| 2001 | 197 |
| 2002 | 132 |
| 2003 | 146 |
| 2004 | 110 |
| 2005 | 122 |
| 2006 | 145 |
| 2007 | 138 |
| 2008 | 212 |
| 2009 | 101 |
| 2010 | 140 |
| 2011 | 134 |
| 2012 | 143 |
| 2013 | 181 |
| 2014 | 120 |
| 2015 | 166 |
| 2016 | 227 |
| 2017 | 174 |
| 2018 | 144 |
| 2019 | 135 |
| 2020 | 110 |
| 2021 | 103 |
| 2022 | 134 |
| 2023 | 138 |
| 2024 | 83 |