| Year | Count |
|---|---|
| 1974 | 5 |
| 1979 | 10 |
| 1982 | 15 |
| 1983 | 10 |
| 1984 | 81 |
| 1984 | 8 |
| 1985 | 431 |
| 1986 | 425 |
| 1986 | 6 |
| 1987 | 330 |
| 1987 | 40 |
| 1988 | 258 |
| 1988 | 55 |
| 1989 | 162 |
| 1989 | 47 |
| 1990 | 320 |
| 1990 | 60 |
| 1991 | 320 |
| 1991 | 141 |
| 1992 | 304 |
| 1992 | 150 |
| 1993 | 330 |
| 1993 | 117 |
| 1994 | 299 |
| 1994 | 64 |
| 1995 | 198 |
| 1995 | 49 |
| 1996 | 184 |
| 1996 | 34 |
| 1997 | 229 |
| 1997 | 22 |
| 1998 | 183 |
| 1998 | 26 |
| 1999 | 96 |
| 1999 | 39 |
| 2000 | 93 |
| 2001 | 52 |
| 2002 | 8 |
| 2003 | 6 |
| 2005 | 15 |
| 2006 | 17 |
| 2008 | 10 |
| 2014 | 12 |