| Year | Rank | Number |
| 2006 | 10267 | 11 |
| 2003 | 10906 | 9 |
| 2002 | 16937 | 5 |
| 2001 | 14528 | 6 |
| 2000 | 10357 | 9 |
| 1999 | 7478 | 13 |
| 1998 | 7355 | 13 |
| 1997 | 9450 | 9 |
| 1996 | 10089 | 8 |
| 1995 | 5329 | 18 |
| 1994 | 6502 | 14 |
| 1993 | 8401 | 10 |
| 1992 | 7294 | 12 |
| 1991 | 10920 | 7 |
| 1990 | 8219 | 10 |
| 1989 | 6359 | 13 |
| 1988 | 6084 | 13 |
| 1987 | 6550 | 11 |
| 1985 | 9987 | 6 |
| 1983 | 9624 | 6 |
| 1981 | 11256 | 5 |