| Year | Count |
|---|---|
| 1932 | 7 |
| 1933 | 5 |
| 1935 | 9 |
| 1936 | 7 |
| 1937 | 7 |
| 1938 | 8 |
| 1939 | 5 |
| 1940 | 8 |
| 1941 | 5 |
| 1943 | 8 |
| 1946 | 24 |
| 1947 | 8 |
| 1948 | 14 |
| 1949 | 8 |
| 1950 | 7 |
| 1951 | 11 |
| 1952 | 5 |
| 1953 | 13 |
| 1954 | 14 |
| 1955 | 16 |
| 1956 | 31 |
| 1957 | 25 |
| 1958 | 21 |
| 1959 | 43 |
| 1960 | 14 |
| 1961 | 41 |
| 1962 | 36 |
| 1963 | 21 |
| 1964 | 28 |
| 1965 | 34 |
| 1966 | 8 |
| 1967 | 40 |
| 1968 | 22 |
| 1969 | 28 |
| 1970 | 12 |
| 1971 | 13 |
| 1972 | 23 |
| 1973 | 23 |
| 1974 | 12 |
| 1975 | 6 |
| 1977 | 10 |
| 1982 | 12 |
| 1984 | 7 |