| Year | Count |
|---|---|
| 1966 | 5 |
| 1974 | 13 |
| 1975 | 7 |
| 1976 | 19 |
| 1976 | 5 |
| 1977 | 42 |
| 1977 | 6 |
| 1978 | 36 |
| 1979 | 52 |
| 1980 | 48 |
| 1980 | 6 |
| 1981 | 43 |
| 1982 | 26 |
| 1983 | 27 |
| 1983 | 6 |
| 1984 | 26 |
| 1985 | 35 |
| 1985 | 6 |
| 1986 | 33 |
| 1987 | 27 |
| 1987 | 7 |
| 1988 | 45 |
| 1988 | 6 |
| 1989 | 42 |
| 1990 | 51 |
| 1990 | 5 |
| 1991 | 38 |
| 1992 | 37 |
| 1993 | 44 |
| 1994 | 35 |
| 1995 | 17 |
| 1996 | 30 |
| 1997 | 25 |
| 1998 | 8 |
| 1999 | 6 |
| 2000 | 12 |
| 2001 | 7 |
| 2002 | 5 |
| 2009 | 6 |