| Year | Count |
|---|---|
| 1941 | 5 |
| 1942 | 28 |
| 1943 | 58 |
| 1944 | 43 |
| 1945 | 64 |
| 1946 | 238 |
| 1947 | 283 |
| 1948 | 218 |
| 1949 | 295 |
| 1950 | 325 |
| 1951 | 409 |
| 1952 | 586 |
| 1953 | 665 |
| 1954 | 822 |
| 1955 | 985 |
| 1956 | 969 |
| 1957 | 1,032 |
| 1958 | 1,203 |
| 1959 | 1,252 |
| 1960 | 1,377 |
| 1961 | 1,337 |
| 1962 | 1,398 |
| 1963 | 929 |
| 1964 | 904 |
| 1965 | 703 |
| 1966 | 568 |
| 1967 | 516 |
| 1968 | 549 |
| 1969 | 492 |
| 1970 | 421 |
| 1971 | 344 |
| 1972 | 234 |
| 1973 | 224 |
| 1974 | 174 |
| 1975 | 131 |
| 1976 | 130 |
| 1977 | 126 |
| 1978 | 95 |
| 1979 | 43 |
| 1980 | 72 |
| 1981 | 32 |
| 1982 | 42 |
| 1983 | 41 |
| 1984 | 31 |
| 1985 | 53 |
| 1986 | 34 |
| 1987 | 20 |
| 1988 | 16 |
| 1991 | 5 |