| Year | Count |
|---|---|
| 1976 | 5 |
| 1977 | 18 |
| 1978 | 18 |
| 1979 | 23 |
| 1980 | 40 |
| 1981 | 26 |
| 1982 | 48 |
| 1983 | 37 |
| 1984 | 18 |
| 1985 | 25 |
| 1986 | 27 |
| 1987 | 30 |
| 1988 | 32 |
| 1989 | 49 |
| 1990 | 44 |
| 1991 | 67 |
| 1992 | 41 |
| 1993 | 63 |
| 1994 | 72 |
| 1995 | 81 |
| 1996 | 88 |
| 1997 | 72 |
| 1998 | 96 |
| 1999 | 87 |
| 2000 | 100 |
| 2001 | 142 |
| 2002 | 164 |
| 2003 | 109 |
| 2004 | 90 |
| 2005 | 120 |
| 2006 | 150 |
| 2007 | 162 |
| 2008 | 131 |
| 2009 | 138 |
| 2010 | 134 |
| 2011 | 211 |
| 2012 | 204 |
| 2013 | 230 |
| 2014 | 224 |
| 2015 | 246 |
| 2016 | 254 |
| 2017 | 230 |
| 2018 | 225 |
| 2019 | 200 |
| 2020 | 153 |
| 2021 | 210 |
| 2022 | 256 |
| 2023 | 212 |
| 2024 | 273 |