| Year | Rank | Number |
| 2011 | 4863 | 19 |
| 2010 | 4416 | 22 |
| 2009 | 4049 | 25 |
| 2008 | 4177 | 24 |
| 2007 | 6045 | 14 |
| 2006 | 4036 | 24 |
| 2005 | 3763 | 25 |
| 2004 | 2809 | 37 |
| 2003 | 3667 | 24 |
| 2002 | 3715 | 23 |
| 2001 | 2953 | 31 |
| 2000 | 3982 | 20 |
| 1999 | 4065 | 18 |
| 1998 | 6025 | 10 |
| 1997 | 4337 | 15 |
| 1996 | 4717 | 13 |
| 1995 | 4146 | 15 |
| 1994 | 4931 | 12 |
| 1993 | 5162 | 11 |