| Year | Count |
|---|---|
| 1933 | 5 |
| 1942 | 9 |
| 1943 | 11 |
| 1945 | 21 |
| 1946 | 17 |
| 1947 | 24 |
| 1948 | 26 |
| 1949 | 17 |
| 1950 | 12 |
| 1951 | 13 |
| 1952 | 18 |
| 1953 | 24 |
| 1954 | 40 |
| 1955 | 44 |
| 1956 | 67 |
| 1957 | 43 |
| 1958 | 47 |
| 1959 | 66 |
| 1960 | 94 |
| 1961 | 60 |
| 1962 | 57 |
| 1963 | 100 |
| 1964 | 144 |
| 1965 | 79 |
| 1966 | 84 |
| 1967 | 51 |
| 1968 | 85 |
| 1969 | 65 |
| 1970 | 214 |
| 1971 | 106 |
| 1972 | 59 |
| 1973 | 24 |
| 1974 | 17 |
| 1976 | 5 |
| 1977 | 7 |
| 1978 | 6 |
| 1981 | 5 |
| 1982 | 5 |
| 1986 | 10 |