| Year | Count |
|---|---|
| 1946 | 13 |
| 1948 | 8 |
| 1949 | 26 |
| 1950 | 13 |
| 1951 | 49 |
| 1952 | 123 |
| 1953 | 166 |
| 1954 | 245 |
| 1955 | 299 |
| 1956 | 401 |
| 1957 | 554 |
| 1958 | 641 |
| 1959 | 733 |
| 1960 | 1,225 |
| 1961 | 1,565 |
| 1962 | 1,585 |
| 1963 | 1,461 |
| 1964 | 1,274 |
| 1965 | 1,219 |
| 1966 | 1,126 |
| 1967 | 1,031 |
| 1968 | 1,028 |
| 1969 | 1,180 |
| 1970 | 1,010 |
| 1971 | 991 |
| 1972 | 782 |
| 1973 | 769 |
| 1974 | 633 |
| 1975 | 569 |
| 1976 | 385 |
| 1977 | 386 |
| 1978 | 267 |
| 1979 | 265 |
| 1980 | 168 |
| 1981 | 167 |
| 1982 | 154 |
| 1983 | 99 |
| 1984 | 58 |
| 1985 | 71 |
| 1986 | 39 |
| 1987 | 30 |
| 1988 | 20 |
| 1989 | 18 |
| 1990 | 20 |
| 1992 | 5 |
| 1997 | 5 |
| 1998 | 14 |
| 2000 | 5 |
| 2007 | 5 |