| Year | Count |
|---|---|
| 1948 | 5 |
| 1949 | 24 |
| 1949 | 6 |
| 1950 | 10 |
| 1951 | 50 |
| 1951 | 5 |
| 1952 | 29 |
| 1952 | 5 |
| 1953 | 169 |
| 1953 | 40 |
| 1954 | 291 |
| 1954 | 37 |
| 1955 | 328 |
| 1955 | 38 |
| 1956 | 468 |
| 1956 | 49 |
| 1957 | 426 |
| 1957 | 30 |
| 1958 | 646 |
| 1958 | 36 |
| 1959 | 836 |
| 1959 | 26 |
| 1960 | 525 |
| 1960 | 32 |
| 1961 | 571 |
| 1961 | 6 |
| 1962 | 568 |
| 1962 | 65 |
| 1963 | 474 |
| 1963 | 5 |
| 1964 | 428 |
| 1965 | 370 |
| 1966 | 287 |
| 1967 | 245 |
| 1968 | 260 |
| 1969 | 243 |
| 1970 | 252 |
| 1971 | 174 |
| 1972 | 99 |
| 1973 | 86 |
| 1974 | 54 |
| 1975 | 47 |
| 1976 | 21 |
| 1977 | 28 |
| 1978 | 12 |
| 1979 | 42 |
| 1980 | 10 |
| 1981 | 6 |
| 1982 | 15 |
| 1983 | 14 |
| 1984 | 11 |
| 1986 | 10 |
| 1990 | 12 |
| 1992 | 5 |