| Year | Rank | Number |
| 2011 | 9858 | 7 |
| 2008 | 11437 | 6 |
| 2007 | 10046 | 7 |
| 2006 | 12538 | 5 |
| 2005 | 6325 | 12 |
| 2004 | 7702 | 9 |
| 2003 | 7414 | 9 |
| 2002 | 7853 | 8 |
| 2001 | 6585 | 10 |
| 2000 | 7643 | 8 |
| 1999 | 9027 | 6 |
| 1998 | 8796 | 6 |
| 1997 | 8456 | 6 |
| 1996 | 6133 | 9 |
| 1995 | 7224 | 7 |
| 1994 | 6526 | 8 |
| 1993 | 9148 | 5 |
| 1992 | 4970 | 11 |
| 1991 | 8578 | 5 |
| 1987 | 5657 | 7 |
| 1984 | 5781 | 6 |