| Year | Count |
|---|---|
| 1972 | 5 |
| 1974 | 5 |
| 1978 | 21 |
| 1979 | 27 |
| 1980 | 5 |
| 1981 | 11 |
| 1982 | 5 |
| 1983 | 38 |
| 1984 | 5 |
| 1985 | 18 |
| 1986 | 10 |
| 1987 | 9 |
| 1988 | 12 |
| 1990 | 5 |
| 1991 | 8 |
| 1992 | 16 |
| 1993 | 11 |
| 1994 | 21 |
| 1995 | 23 |
| 1996 | 36 |
| 1997 | 22 |
| 1998 | 69 |
| 1999 | 52 |
| 2000 | 55 |
| 2001 | 108 |
| 2002 | 84 |
| 2003 | 94 |
| 2004 | 62 |
| 2005 | 91 |
| 2006 | 116 |
| 2007 | 78 |
| 2008 | 117 |
| 2009 | 63 |
| 2010 | 75 |
| 2011 | 108 |
| 2012 | 73 |
| 2013 | 77 |
| 2014 | 80 |
| 2015 | 62 |
| 2016 | 32 |
| 2017 | 85 |
| 2018 | 62 |
| 2019 | 13 |
| 2020 | 19 |
| 2021 | 30 |
| 2022 | 31 |
| 2023 | 24 |
| 2024 | 9 |