| Year | Rank | Number |
| 2009 | 17759 | 5 |
| 2006 | 11609 | 9 |
| 2004 | 11829 | 8 |
| 2003 | 11522 | 8 |
| 2002 | 11340 | 8 |
| 2001 | 6678 | 16 |
| 2000 | 10935 | 8 |
| 1999 | 6899 | 14 |
| 1998 | 8704 | 10 |
| 1997 | 5455 | 18 |
| 1996 | 6779 | 13 |
| 1995 | 8209 | 10 |
| 1994 | 9741 | 8 |
| 1993 | 5465 | 17 |
| 1992 | 6369 | 14 |
| 1991 | 7046 | 12 |
| 1990 | 7400 | 11 |
| 1989 | 6224 | 13 |
| 1988 | 5365 | 15 |
| 1987 | 6414 | 11 |
| 1986 | 6681 | 10 |
| 1985 | 7046 | 9 |