| Year | Count |
|---|---|
| 1953 | 10 |
| 1954 | 10 |
| 1956 | 35 |
| 1957 | 50 |
| 1958 | 70 |
| 1959 | 64 |
| 1960 | 88 |
| 1961 | 95 |
| 1962 | 84 |
| 1963 | 132 |
| 1964 | 123 |
| 1965 | 123 |
| 1966 | 107 |
| 1967 | 64 |
| 1968 | 128 |
| 1969 | 125 |
| 1970 | 206 |
| 1971 | 179 |
| 1972 | 84 |
| 1973 | 135 |
| 1974 | 75 |
| 1975 | 129 |
| 1976 | 99 |
| 1977 | 123 |
| 1978 | 67 |
| 1979 | 97 |
| 1980 | 143 |
| 1981 | 206 |
| 1982 | 135 |
| 1983 | 127 |
| 1984 | 99 |
| 1985 | 137 |
| 1986 | 105 |
| 1987 | 106 |
| 1988 | 44 |
| 1989 | 39 |
| 1990 | 32 |
| 1991 | 7 |
| 1992 | 10 |
| 2010 | 5 |