| Year | Count |
|---|---|
| 1957 | 10 |
| 1960 | 5 |
| 1961 | 18 |
| 1962 | 5 |
| 1963 | 10 |
| 1965 | 11 |
| 1966 | 15 |
| 1967 | 6 |
| 1969 | 28 |
| 1969 | 5 |
| 1970 | 45 |
| 1970 | 58 |
| 1971 | 47 |
| 1971 | 114 |
| 1972 | 16 |
| 1972 | 115 |
| 1973 | 40 |
| 1973 | 95 |
| 1974 | 17 |
| 1974 | 66 |
| 1975 | 38 |
| 1975 | 105 |
| 1976 | 222 |
| 1976 | 111 |
| 1977 | 277 |
| 1977 | 51 |
| 1978 | 216 |
| 1978 | 42 |
| 1979 | 192 |
| 1979 | 37 |
| 1980 | 147 |
| 1980 | 34 |
| 1981 | 126 |
| 1981 | 21 |
| 1982 | 95 |
| 1983 | 48 |
| 1984 | 49 |
| 1984 | 6 |
| 1985 | 108 |
| 1986 | 52 |
| 1987 | 27 |
| 1988 | 46 |
| 1989 | 44 |
| 1989 | 6 |
| 1990 | 6 |
| 1991 | 20 |
| 1992 | 12 |
| 1993 | 5 |
| 1993 | 5 |
| 1994 | 5 |
| 1996 | 10 |
| 2005 | 10 |