| Year | Count |
|---|---|
| 1941 | 6 |
| 1943 | 13 |
| 1944 | 33 |
| 1945 | 104 |
| 1946 | 66 |
| 1947 | 122 |
| 1948 | 67 |
| 1949 | 43 |
| 1950 | 33 |
| 1951 | 21 |
| 1952 | 11 |
| 1954 | 11 |
| 1955 | 10 |
| 1956 | 15 |
| 1957 | 18 |
| 1958 | 20 |
| 1959 | 30 |
| 1960 | 24 |
| 1961 | 26 |
| 1963 | 13 |
| 1964 | 12 |
| 1965 | 13 |
| 1966 | 9 |
| 1967 | 21 |
| 1968 | 10 |
| 1969 | 18 |
| 1970 | 10 |
| 1971 | 10 |
| 1972 | 7 |
| 1974 | 6 |
| 1975 | 6 |
| 1976 | 8 |
| 1978 | 10 |