| Year | Count |
|---|---|
| 1943 | 5 |
| 1947 | 12 |
| 1948 | 6 |
| 1949 | 5 |
| 1950 | 21 |
| 1951 | 27 |
| 1952 | 48 |
| 1953 | 59 |
| 1954 | 66 |
| 1955 | 161 |
| 1956 | 102 |
| 1957 | 166 |
| 1958 | 286 |
| 1959 | 266 |
| 1960 | 306 |
| 1961 | 504 |
| 1962 | 650 |
| 1963 | 695 |
| 1964 | 654 |
| 1965 | 369 |
| 1966 | 271 |
| 1967 | 293 |
| 1968 | 283 |
| 1969 | 249 |
| 1970 | 245 |
| 1971 | 148 |
| 1972 | 127 |
| 1973 | 68 |
| 1974 | 41 |
| 1975 | 29 |
| 1976 | 17 |
| 1977 | 32 |
| 1979 | 9 |
| 1981 | 11 |
| 1982 | 5 |
| 1984 | 6 |
| 1987 | 6 |
| 1989 | 6 |
| 1990 | 5 |
| 1994 | 7 |