| Year | Count |
|---|---|
| 1945 | 6 |
| 1946 | 9 |
| 1947 | 50 |
| 1948 | 69 |
| 1949 | 96 |
| 1950 | 111 |
| 1951 | 90 |
| 1952 | 161 |
| 1953 | 211 |
| 1954 | 170 |
| 1955 | 90 |
| 1956 | 146 |
| 1957 | 300 |
| 1958 | 252 |
| 1959 | 204 |
| 1960 | 152 |
| 1961 | 144 |
| 1962 | 162 |
| 1963 | 77 |
| 1964 | 139 |
| 1965 | 141 |
| 1966 | 136 |
| 1967 | 188 |
| 1968 | 234 |
| 1969 | 209 |
| 1970 | 231 |
| 1971 | 136 |
| 1972 | 143 |
| 1973 | 125 |
| 1974 | 75 |
| 1975 | 43 |
| 1976 | 27 |
| 1977 | 5 |
| 1979 | 10 |
| 1980 | 16 |
| 1981 | 5 |
| 1987 | 5 |
| 1990 | 5 |