| Year | Count |
|---|---|
| 1941 | 6 |
| 1945 | 10 |
| 1948 | 5 |
| 1949 | 24 |
| 1950 | 22 |
| 1951 | 34 |
| 1952 | 37 |
| 1953 | 45 |
| 1954 | 31 |
| 1955 | 36 |
| 1956 | 66 |
| 1957 | 79 |
| 1958 | 83 |
| 1959 | 148 |
| 1960 | 110 |
| 1961 | 142 |
| 1962 | 267 |
| 1963 | 98 |
| 1964 | 80 |
| 1965 | 146 |
| 1966 | 128 |
| 1967 | 100 |
| 1968 | 171 |
| 1969 | 127 |
| 1970 | 200 |
| 1971 | 193 |
| 1972 | 234 |
| 1973 | 106 |
| 1974 | 152 |
| 1975 | 158 |
| 1976 | 119 |
| 1977 | 82 |
| 1978 | 77 |
| 1979 | 69 |
| 1980 | 58 |
| 1981 | 48 |
| 1982 | 65 |
| 1983 | 25 |
| 1984 | 53 |
| 1985 | 86 |
| 1986 | 22 |
| 1987 | 21 |
| 1988 | 9 |
| 1990 | 5 |
| 1991 | 20 |
| 1993 | 5 |
| 2008 | 6 |