| Year | Count |
|---|---|
| 1945 | 13 |
| 1946 | 17 |
| 1947 | 23 |
| 1948 | 5 |
| 1949 | 18 |
| 1950 | 21 |
| 1951 | 15 |
| 1952 | 25 |
| 1953 | 25 |
| 1954 | 35 |
| 1955 | 32 |
| 1956 | 33 |
| 1957 | 108 |
| 1958 | 144 |
| 1959 | 112 |
| 1960 | 106 |
| 1961 | 100 |
| 1963 | 34 |
| 1964 | 25 |
| 1965 | 51 |
| 1966 | 36 |
| 1967 | 30 |
| 1968 | 29 |
| 1969 | 29 |
| 1970 | 16 |
| 1971 | 17 |
| 1972 | 17 |
| 1973 | 9 |
| 1974 | 12 |
| 1975 | 13 |
| 1976 | 8 |
| 1977 | 14 |
| 1981 | 7 |
| 1982 | 6 |
| 1983 | 7 |
| 1984 | 6 |
| 1985 | 9 |
| 1986 | 6 |
| 1988 | 6 |
| 1989 | 8 |
| 1990 | 6 |
| 1993 | 5 |
| 1994 | 5 |