| Year | Count |
|---|---|
| 1941 | 7 |
| 1943 | 32 |
| 1944 | 8 |
| 1945 | 24 |
| 1946 | 68 |
| 1947 | 105 |
| 1948 | 109 |
| 1949 | 52 |
| 1950 | 134 |
| 1951 | 226 |
| 1952 | 252 |
| 1953 | 489 |
| 1954 | 866 |
| 1955 | 430 |
| 1956 | 411 |
| 1957 | 723 |
| 1958 | 993 |
| 1959 | 906 |
| 1960 | 817 |
| 1961 | 609 |
| 1962 | 398 |
| 1963 | 390 |
| 1964 | 314 |
| 1965 | 211 |
| 1966 | 126 |
| 1967 | 154 |
| 1968 | 95 |
| 1969 | 124 |
| 1970 | 133 |
| 1971 | 122 |
| 1972 | 47 |
| 1973 | 54 |
| 1974 | 11 |
| 1975 | 28 |
| 1976 | 5 |