| Year | Count |
|---|---|
| 1949 | 5 |
| 1951 | 15 |
| 1952 | 7 |
| 1953 | 5 |
| 1954 | 11 |
| 1955 | 16 |
| 1956 | 34 |
| 1957 | 58 |
| 1958 | 28 |
| 1959 | 78 |
| 1960 | 83 |
| 1961 | 77 |
| 1962 | 77 |
| 1963 | 85 |
| 1964 | 114 |
| 1965 | 89 |
| 1966 | 116 |
| 1967 | 87 |
| 1968 | 113 |
| 1969 | 93 |
| 1970 | 89 |
| 1971 | 87 |
| 1972 | 43 |
| 1973 | 69 |
| 1974 | 61 |
| 1975 | 30 |
| 1976 | 19 |
| 1977 | 42 |
| 1978 | 45 |
| 1979 | 10 |
| 1980 | 28 |
| 1981 | 44 |
| 1982 | 34 |
| 1983 | 17 |
| 1984 | 21 |
| 1985 | 26 |
| 1986 | 20 |
| 1987 | 10 |
| 1988 | 10 |
| 1989 | 10 |
| 1992 | 5 |
| 2017 | 15 |