| Year | Rank | Number |
| 2011 | 6756 | 19 |
| 2010 | 7146 | 18 |
| 2009 | 5817 | 24 |
| 2008 | 7324 | 18 |
| 2007 | 8424 | 15 |
| 2006 | 7775 | 16 |
| 2005 | 10768 | 10 |
| 2004 | 8633 | 13 |
| 2003 | 7142 | 16 |
| 2002 | 10928 | 9 |
| 2001 | 10847 | 9 |
| 2000 | 12880 | 7 |
| 1999 | 16423 | 5 |
| 1998 | 12173 | 7 |
| 1997 | 9648 | 9 |
| 1996 | 15403 | 5 |
| 1995 | 10319 | 8 |
| 1994 | 10332 | 8 |
| 1993 | 11523 | 7 |