| Year | Count |
|---|---|
| 1975 | 10 |
| 1979 | 6 |
| 1980 | 7 |
| 1981 | 13 |
| 1982 | 6 |
| 1983 | 7 |
| 1984 | 6 |
| 1985 | 14 |
| 1986 | 7 |
| 1987 | 10 |
| 1988 | 10 |
| 1990 | 13 |
| 1991 | 21 |
| 1992 | 15 |
| 1993 | 20 |
| 1994 | 17 |
| 1995 | 24 |
| 1996 | 32 |
| 1997 | 30 |
| 1998 | 19 |
| 1999 | 31 |
| 2000 | 26 |
| 2001 | 41 |
| 2002 | 12 |
| 2004 | 32 |
| 2005 | 89 |
| 2006 | 70 |
| 2007 | 63 |
| 2008 | 85 |
| 2009 | 66 |
| 2010 | 68 |
| 2012 | 52 |
| 2013 | 60 |
| 2014 | 27 |
| 2015 | 60 |
| 2016 | 40 |
| 2017 | 43 |
| 2018 | 28 |
| 2019 | 33 |
| 2021 | 39 |
| 2022 | 51 |
| 2023 | 118 |
| 2024 | 102 |