| Year | Count |
|---|---|
| 1973 | 6 |
| 1974 | 5 |
| 1978 | 9 |
| 1979 | 69 |
| 1980 | 120 |
| 1981 | 91 |
| 1982 | 81 |
| 1983 | 59 |
| 1984 | 50 |
| 1986 | 39 |
| 1987 | 32 |
| 1988 | 46 |
| 1989 | 43 |
| 1990 | 31 |
| 1991 | 27 |
| 1992 | 31 |
| 1993 | 40 |
| 1994 | 39 |
| 1995 | 35 |
| 1996 | 29 |
| 1997 | 21 |
| 1998 | 37 |
| 1999 | 21 |
| 2000 | 31 |
| 2001 | 37 |
| 2002 | 33 |
| 2003 | 25 |
| 2004 | 33 |
| 2005 | 29 |
| 2006 | 21 |
| 2007 | 38 |
| 2008 | 29 |
| 2009 | 29 |
| 2010 | 31 |
| 2011 | 31 |
| 2012 | 36 |
| 2013 | 28 |
| 2014 | 30 |
| 2015 | 26 |
| 2016 | 64 |
| 2017 | 60 |
| 2018 | 50 |
| 2019 | 84 |
| 2020 | 37 |
| 2021 | 35 |
| 2022 | 31 |
| 2023 | 39 |
| 2024 | 27 |