| Year | Count |
|---|---|
| 1977 | 10 |
| 1977 | 6 |
| 1980 | 5 |
| 1980 | 6 |
| 1981 | 7 |
| 1982 | 10 |
| 1983 | 24 |
| 1983 | 20 |
| 1984 | 107 |
| 1984 | 10 |
| 1985 | 385 |
| 1985 | 7 |
| 1986 | 328 |
| 1986 | 24 |
| 1987 | 269 |
| 1987 | 24 |
| 1988 | 194 |
| 1988 | 52 |
| 1989 | 158 |
| 1989 | 162 |
| 1990 | 219 |
| 1990 | 178 |
| 1991 | 204 |
| 1991 | 231 |
| 1992 | 231 |
| 1992 | 260 |
| 1993 | 184 |
| 1993 | 155 |
| 1994 | 169 |
| 1994 | 65 |
| 1995 | 79 |
| 1995 | 61 |
| 1996 | 145 |
| 1996 | 36 |
| 1997 | 107 |
| 1997 | 22 |
| 1998 | 73 |
| 1998 | 19 |
| 1999 | 53 |
| 1999 | 13 |
| 2000 | 13 |
| 2000 | 5 |
| 2001 | 5 |
| 2002 | 9 |
| 2006 | 6 |
| 2007 | 6 |