| Year | Count |
|---|---|
| 1959 | 10 |
| 1960 | 15 |
| 1961 | 32 |
| 1962 | 12 |
| 1963 | 21 |
| 1964 | 18 |
| 1965 | 64 |
| 1966 | 10 |
| 1967 | 21 |
| 1968 | 28 |
| 1969 | 21 |
| 1970 | 57 |
| 1970 | 6 |
| 1971 | 63 |
| 1972 | 52 |
| 1972 | 12 |
| 1973 | 73 |
| 1973 | 7 |
| 1974 | 56 |
| 1974 | 23 |
| 1975 | 101 |
| 1975 | 28 |
| 1976 | 56 |
| 1976 | 15 |
| 1977 | 80 |
| 1977 | 14 |
| 1978 | 50 |
| 1978 | 36 |
| 1979 | 58 |
| 1979 | 33 |
| 1980 | 52 |
| 1980 | 38 |
| 1981 | 55 |
| 1981 | 30 |
| 1982 | 26 |
| 1983 | 49 |
| 1983 | 26 |
| 1984 | 53 |
| 1984 | 11 |
| 1985 | 16 |
| 1985 | 50 |
| 1986 | 19 |
| 1986 | 13 |
| 1987 | 30 |
| 1987 | 24 |
| 1988 | 12 |
| 1988 | 37 |
| 1989 | 45 |
| 1990 | 18 |
| 1991 | 5 |
| 1991 | 17 |
| 1992 | 30 |
| 1993 | 16 |
| 1995 | 8 |
| 1999 | 5 |
| 2001 | 20 |