| Year | Count |
|---|---|
| 1945 | 10 |
| 1952 | 5 |
| 1954 | 5 |
| 1961 | 15 |
| 1964 | 5 |
| 1966 | 5 |
| 1967 | 6 |
| 1970 | 13 |
| 1972 | 16 |
| 1973 | 5 |
| 1974 | 11 |
| 1975 | 12 |
| 1976 | 23 |
| 1977 | 29 |
| 1978 | 5 |
| 1979 | 6 |
| 1980 | 18 |
| 1981 | 7 |
| 1982 | 24 |
| 1983 | 10 |
| 1985 | 18 |
| 1986 | 18 |
| 1987 | 18 |
| 1988 | 9 |
| 1989 | 10 |
| 1990 | 10 |
| 1991 | 20 |
| 1992 | 13 |
| 1994 | 10 |
| 1995 | 15 |
| 1996 | 24 |
| 1997 | 12 |
| 2000 | 12 |
| 2001 | 10 |
| 2003 | 14 |
| 2005 | 14 |
| 2006 | 20 |
| 2008 | 7 |
| 2011 | 5 |
| 2014 | 5 |
| 2016 | 5 |
| 2021 | 8 |