| Year | Count |
|---|---|
| 1965 | 8 |
| 1966 | 90 |
| 1967 | 118 |
| 1968 | 104 |
| 1969 | 114 |
| 1970 | 63 |
| 1971 | 66 |
| 1972 | 47 |
| 1973 | 42 |
| 1974 | 32 |
| 1975 | 30 |
| 1976 | 31 |
| 1977 | 68 |
| 1978 | 44 |
| 1979 | 58 |
| 1980 | 46 |
| 1981 | 28 |
| 1982 | 26 |
| 1983 | 23 |
| 1984 | 15 |
| 1985 | 13 |
| 1986 | 16 |
| 1987 | 9 |
| 1988 | 6 |
| 1989 | 12 |
| 1990 | 10 |
| 1991 | 11 |
| 1992 | 12 |
| 1993 | 15 |
| 1994 | 5 |
| 1996 | 10 |
| 1997 | 9 |
| 1998 | 5 |
| 1999 | 9 |
| 2000 | 7 |
| 2001 | 6 |
| 2002 | 5 |
| 2003 | 9 |
| 2006 | 8 |
| 2007 | 5 |
| 2008 | 6 |
| 2009 | 5 |
| 2011 | 6 |
| 2012 | 11 |
| 2014 | 6 |
| 2015 | 30 |
| 2017 | 21 |
| 2018 | 12 |
| 2023 | 10 |