| Year | Count |
|---|---|
| 1964 | 5 |
| 1965 | 18 |
| 1966 | 6 |
| 1966 | 5 |
| 1967 | 15 |
| 1968 | 32 |
| 1969 | 28 |
| 1970 | 34 |
| 1971 | 14 |
| 1971 | 6 |
| 1972 | 35 |
| 1973 | 73 |
| 1973 | 5 |
| 1974 | 66 |
| 1974 | 8 |
| 1975 | 70 |
| 1975 | 7 |
| 1976 | 64 |
| 1976 | 8 |
| 1977 | 58 |
| 1978 | 46 |
| 1978 | 8 |
| 1979 | 45 |
| 1980 | 30 |
| 1980 | 10 |
| 1981 | 10 |
| 1981 | 6 |
| 1982 | 43 |
| 1982 | 5 |
| 1983 | 12 |
| 1984 | 45 |
| 1985 | 60 |
| 1985 | 5 |
| 1986 | 76 |
| 1986 | 6 |
| 1987 | 76 |
| 1987 | 6 |
| 1988 | 46 |
| 1988 | 5 |
| 1989 | 78 |
| 1990 | 59 |
| 1990 | 5 |
| 1991 | 66 |
| 1991 | 5 |
| 1992 | 20 |
| 1993 | 34 |
| 1993 | 8 |
| 1994 | 33 |
| 1995 | 32 |
| 1996 | 36 |
| 1997 | 36 |
| 1998 | 44 |
| 1999 | 22 |
| 2002 | 10 |
| 2005 | 10 |