| Year | Count |
|---|---|
| 1943 | 6 |
| 1946 | 36 |
| 1947 | 84 |
| 1948 | 187 |
| 1949 | 205 |
| 1950 | 205 |
| 1951 | 209 |
| 1952 | 226 |
| 1953 | 298 |
| 1954 | 310 |
| 1955 | 406 |
| 1956 | 531 |
| 1957 | 760 |
| 1958 | 965 |
| 1959 | 1,065 |
| 1960 | 872 |
| 1961 | 681 |
| 1962 | 538 |
| 1963 | 410 |
| 1964 | 303 |
| 1965 | 229 |
| 1966 | 151 |
| 1967 | 84 |
| 1968 | 40 |
| 1969 | 43 |
| 1970 | 70 |
| 1971 | 29 |
| 1972 | 16 |
| 1973 | 26 |
| 1974 | 5 |
| 1977 | 14 |
| 1978 | 10 |
| 1979 | 12 |
| 1980 | 5 |
| 1981 | 8 |
| 1982 | 5 |