| Year | Count |
|---|---|
| 1940 | 12 |
| 1944 | 20 |
| 1946 | 58 |
| 1947 | 48 |
| 1948 | 5 |
| 1949 | 76 |
| 1950 | 52 |
| 1951 | 44 |
| 1952 | 8 |
| 1953 | 31 |
| 1954 | 36 |
| 1955 | 48 |
| 1956 | 13 |
| 1957 | 56 |
| 1958 | 53 |
| 1959 | 65 |
| 1960 | 33 |
| 1961 | 42 |
| 1962 | 12 |
| 1963 | 14 |
| 1964 | 26 |
| 1965 | 9 |
| 1966 | 10 |
| 1967 | 32 |
| 1968 | 16 |
| 1969 | 11 |
| 1970 | 26 |
| 1971 | 13 |
| 1972 | 17 |
| 1973 | 6 |
| 1974 | 11 |
| 1975 | 12 |
| 1976 | 7 |
| 1977 | 24 |
| 1978 | 10 |
| 1979 | 5 |
| 1980 | 15 |
| 1981 | 14 |
| 1984 | 12 |
| 1985 | 14 |
| 1986 | 16 |
| 1988 | 5 |
| 1989 | 6 |
| 1990 | 5 |
| 1994 | 6 |
| 1995 | 5 |
| 1996 | 5 |