| Year | Count |
|---|---|
| 1974 | 185 |
| 1974 | 14 |
| 1975 | 286 |
| 1975 | 23 |
| 1976 | 208 |
| 1977 | 238 |
| 1978 | 256 |
| 1979 | 229 |
| 1980 | 201 |
| 1981 | 185 |
| 1982 | 122 |
| 1983 | 125 |
| 1984 | 106 |
| 1985 | 113 |
| 1986 | 109 |
| 1987 | 77 |
| 1988 | 74 |
| 1989 | 51 |
| 1990 | 34 |
| 1991 | 82 |
| 1992 | 54 |
| 1993 | 60 |
| 1994 | 37 |
| 1995 | 29 |
| 1996 | 36 |
| 1997 | 46 |
| 1998 | 37 |
| 1999 | 40 |
| 2000 | 12 |
| 2001 | 10 |