| Year | Count |
|---|---|
| 1937 | 5 |
| 1941 | 16 |
| 1942 | 7 |
| 1945 | 5 |
| 1946 | 10 |
| 1949 | 10 |
| 1950 | 5 |
| 1952 | 6 |
| 1953 | 10 |
| 1954 | 6 |
| 1955 | 5 |
| 1956 | 10 |
| 1957 | 7 |
| 1958 | 42 |
| 1959 | 15 |
| 1960 | 74 |
| 1961 | 97 |
| 1962 | 78 |
| 1963 | 71 |
| 1964 | 64 |
| 1965 | 69 |
| 1966 | 32 |
| 1967 | 59 |
| 1968 | 23 |
| 1969 | 71 |
| 1970 | 62 |
| 1971 | 19 |
| 1973 | 5 |
| 1974 | 11 |
| 1979 | 5 |
| 1980 | 21 |
| 1981 | 7 |
| 1983 | 5 |
| 1984 | 8 |