| Year | Count |
|---|---|
| 1940 | 6 |
| 1956 | 6 |
| 1960 | 8 |
| 1961 | 18 |
| 1970 | 5 |
| 1971 | 5 |
| 1973 | 5 |
| 1974 | 14 |
| 1976 | 8 |
| 1977 | 11 |
| 1978 | 6 |
| 1979 | 6 |
| 1980 | 12 |
| 1981 | 7 |
| 1982 | 8 |
| 1983 | 7 |
| 1984 | 8 |
| 1985 | 51 |
| 1986 | 16 |
| 1987 | 12 |
| 1988 | 7 |
| 1989 | 10 |
| 1991 | 12 |
| 1992 | 26 |
| 1993 | 7 |
| 1994 | 24 |
| 1995 | 25 |
| 1996 | 8 |
| 1997 | 33 |
| 1998 | 50 |
| 2000 | 8 |
| 2001 | 109 |
| 2002 | 56 |
| 2003 | 36 |
| 2004 | 55 |
| 2005 | 73 |
| 2006 | 34 |
| 2007 | 77 |
| 2008 | 137 |
| 2009 | 21 |
| 2011 | 8 |
| 2014 | 15 |
| 2016 | 9 |
| 2017 | 9 |
| 2018 | 6 |
| 2020 | 9 |
| 2022 | 7 |
| 2023 | 7 |
| 2024 | 6 |