| Year | Count |
|---|---|
| 1974 | 5 |
| 1975 | 10 |
| 1976 | 5 |
| 1978 | 20 |
| 1979 | 12 |
| 1980 | 11 |
| 1981 | 11 |
| 1982 | 23 |
| 1983 | 40 |
| 1984 | 29 |
| 1985 | 54 |
| 1986 | 92 |
| 1987 | 167 |
| 1988 | 110 |
| 1989 | 145 |
| 1990 | 200 |
| 1991 | 249 |
| 1992 | 151 |
| 1993 | 187 |
| 1994 | 210 |
| 1995 | 197 |
| 1996 | 138 |
| 1997 | 221 |
| 1998 | 216 |
| 1999 | 174 |
| 2000 | 128 |
| 2001 | 134 |
| 2002 | 109 |
| 2003 | 87 |
| 2004 | 130 |
| 2005 | 118 |
| 2006 | 144 |
| 2007 | 128 |
| 2008 | 154 |
| 2009 | 133 |
| 2010 | 131 |
| 2011 | 99 |
| 2012 | 99 |
| 2013 | 79 |
| 2014 | 106 |
| 2015 | 186 |
| 2016 | 137 |
| 2017 | 108 |
| 2018 | 127 |
| 2019 | 162 |
| 2020 | 109 |
| 2021 | 107 |
| 2022 | 117 |
| 2022 | 9 |
| 2023 | 136 |
| 2023 | 6 |
| 2024 | 127 |
| 2024 | 10 |