| Year | Count |
|---|---|
| 1949 | 6 |
| 1952 | 5 |
| 1953 | 5 |
| 1954 | 10 |
| 1955 | 13 |
| 1956 | 5 |
| 1957 | 15 |
| 1958 | 20 |
| 1959 | 26 |
| 1960 | 27 |
| 1961 | 33 |
| 1962 | 24 |
| 1963 | 77 |
| 1964 | 20 |
| 1965 | 21 |
| 1966 | 41 |
| 1967 | 38 |
| 1968 | 30 |
| 1969 | 47 |
| 1970 | 17 |
| 1971 | 30 |
| 1972 | 15 |
| 1973 | 20 |
| 1974 | 12 |
| 1975 | 12 |
| 1976 | 17 |
| 1978 | 25 |
| 1979 | 6 |
| 1980 | 43 |
| 1981 | 6 |
| 1982 | 7 |
| 1983 | 6 |
| 1985 | 19 |
| 1986 | 5 |
| 1987 | 5 |
| 1988 | 7 |
| 1989 | 15 |
| 1992 | 17 |
| 1993 | 12 |
| 1994 | 20 |
| 1995 | 6 |
| 2002 | 5 |