| Year | Count |
|---|---|
| 1946 | 18 |
| 1947 | 42 |
| 1948 | 11 |
| 1949 | 18 |
| 1950 | 14 |
| 1951 | 36 |
| 1952 | 21 |
| 1953 | 22 |
| 1954 | 57 |
| 1955 | 45 |
| 1956 | 50 |
| 1957 | 56 |
| 1958 | 80 |
| 1959 | 58 |
| 1960 | 78 |
| 1961 | 108 |
| 1962 | 82 |
| 1963 | 95 |
| 1964 | 119 |
| 1965 | 112 |
| 1966 | 143 |
| 1967 | 59 |
| 1968 | 69 |
| 1969 | 54 |
| 1970 | 48 |
| 1971 | 47 |
| 1972 | 43 |
| 1973 | 14 |
| 1974 | 26 |
| 1976 | 6 |