| Year | Count |
|---|---|
| 1936 | 5 |
| 1949 | 9 |
| 1950 | 10 |
| 1951 | 11 |
| 1952 | 13 |
| 1953 | 16 |
| 1954 | 18 |
| 1955 | 18 |
| 1956 | 24 |
| 1957 | 40 |
| 1958 | 56 |
| 1959 | 50 |
| 1960 | 86 |
| 1961 | 100 |
| 1962 | 24 |
| 1963 | 48 |
| 1964 | 39 |
| 1965 | 34 |
| 1966 | 51 |
| 1967 | 52 |
| 1968 | 28 |
| 1969 | 41 |
| 1970 | 43 |
| 1971 | 18 |
| 1972 | 32 |
| 1973 | 30 |
| 1974 | 40 |
| 1975 | 30 |
| 1976 | 26 |
| 1977 | 14 |
| 1978 | 34 |
| 1979 | 32 |
| 1980 | 25 |
| 1981 | 24 |
| 1982 | 12 |
| 1983 | 18 |
| 1984 | 25 |
| 1985 | 7 |
| 1986 | 20 |
| 1987 | 31 |
| 1988 | 9 |
| 1989 | 5 |
| 1991 | 24 |
| 1992 | 6 |
| 1993 | 10 |
| 1994 | 6 |
| 1996 | 10 |
| 2000 | 5 |
| 2006 | 5 |
| 2010 | 8 |