| Year | Count |
|---|---|
| 1932 | 6 |
| 1939 | 6 |
| 1941 | 7 |
| 1943 | 16 |
| 1944 | 11 |
| 1945 | 12 |
| 1946 | 8 |
| 1947 | 21 |
| 1948 | 13 |
| 1949 | 16 |
| 1950 | 14 |
| 1951 | 10 |
| 1952 | 17 |
| 1953 | 16 |
| 1954 | 10 |
| 1955 | 15 |
| 1956 | 18 |
| 1957 | 20 |
| 1958 | 42 |
| 1959 | 36 |
| 1960 | 30 |
| 1961 | 18 |
| 1962 | 11 |
| 1963 | 10 |
| 1964 | 9 |
| 1965 | 8 |
| 1966 | 11 |
| 1967 | 10 |
| 1968 | 10 |
| 1969 | 6 |
| 1970 | 7 |
| 1972 | 5 |
| 1989 | 5 |
| 1990 | 6 |
| 1992 | 6 |