| Year | Count |
|---|---|
| 1976 | 15 |
| 1977 | 24 |
| 1978 | 31 |
| 1979 | 67 |
| 1980 | 44 |
| 1981 | 31 |
| 1982 | 27 |
| 1983 | 38 |
| 1984 | 18 |
| 1985 | 5 |
| 1986 | 12 |
| 1987 | 5 |
| 1988 | 12 |
| 1989 | 5 |
| 1990 | 5 |
| 1993 | 24 |
| 1994 | 42 |
| 1995 | 10 |
| 1996 | 27 |
| 2003 | 7 |
| 2005 | 24 |
| 2006 | 26 |
| 2007 | 11 |
| 2008 | 10 |
| 2009 | 12 |
| 2010 | 43 |
| 2011 | 26 |
| 2012 | 10 |
| 2013 | 5 |
| 2014 | 6 |
| 2015 | 15 |
| 2016 | 25 |
| 2017 | 22 |
| 2018 | 36 |
| 2019 | 43 |
| 2020 | 39 |
| 2021 | 5 |
| 2023 | 11 |