| Year | Count |
|---|---|
| 1938 | 11 |
| 1939 | 15 |
| 1941 | 43 |
| 1942 | 55 |
| 1943 | 31 |
| 1944 | 34 |
| 1945 | 20 |
| 1946 | 58 |
| 1947 | 73 |
| 1948 | 57 |
| 1949 | 55 |
| 1950 | 42 |
| 1951 | 29 |
| 1952 | 74 |
| 1953 | 74 |
| 1954 | 48 |
| 1955 | 38 |
| 1956 | 34 |
| 1957 | 28 |
| 1958 | 36 |
| 1959 | 30 |
| 1960 | 26 |
| 1961 | 13 |
| 1962 | 12 |
| 1964 | 7 |
| 1965 | 12 |
| 1966 | 11 |
| 1967 | 15 |
| 1968 | 15 |
| 1969 | 5 |
| 1970 | 13 |
| 1974 | 5 |
| 1978 | 10 |