| Year | Count |
|---|---|
| 1969 | 6 |
| 1975 | 20 |
| 1976 | 10 |
| 1977 | 5 |
| 1978 | 5 |
| 1979 | 10 |
| 1980 | 6 |
| 1981 | 7 |
| 1982 | 34 |
| 1984 | 20 |
| 1985 | 12 |
| 1986 | 14 |
| 1987 | 32 |
| 1990 | 14 |
| 1991 | 7 |
| 1994 | 5 |
| 1995 | 12 |
| 1996 | 21 |
| 1997 | 7 |
| 1998 | 5 |
| 1999 | 11 |
| 2000 | 34 |
| 2001 | 22 |
| 2002 | 5 |
| 2003 | 25 |
| 2004 | 61 |
| 2005 | 78 |
| 2006 | 56 |
| 2007 | 33 |
| 2008 | 70 |
| 2009 | 15 |
| 2010 | 69 |
| 2011 | 40 |
| 2012 | 27 |
| 2013 | 15 |
| 2014 | 50 |
| 2015 | 48 |
| 2016 | 38 |
| 2017 | 47 |
| 2018 | 27 |
| 2019 | 21 |
| 2020 | 14 |
| 2021 | 7 |
| 2022 | 30 |
| 2023 | 21 |
| 2024 | 18 |