| Year | Count |
|---|---|
| 1945 | 5 |
| 1947 | 6 |
| 1948 | 15 |
| 1950 | 10 |
| 1952 | 12 |
| 1954 | 5 |
| 1955 | 5 |
| 1956 | 5 |
| 1957 | 5 |
| 1958 | 17 |
| 1959 | 12 |
| 1962 | 14 |
| 1964 | 5 |
| 1965 | 6 |
| 1966 | 12 |
| 1968 | 6 |
| 1969 | 5 |
| 1970 | 12 |
| 1971 | 12 |
| 1972 | 10 |
| 1973 | 8 |
| 1975 | 16 |
| 1976 | 10 |
| 1978 | 18 |
| 1979 | 5 |
| 1981 | 7 |
| 1982 | 15 |
| 1984 | 7 |
| 1985 | 20 |
| 1987 | 16 |
| 1988 | 14 |
| 1989 | 12 |
| 1990 | 7 |
| 1991 | 7 |
| 1993 | 8 |
| 1994 | 7 |
| 1996 | 6 |
| 1998 | 8 |
| 2003 | 11 |
| 2008 | 6 |
| 2009 | 10 |