| Year | Rank | Number |
| 2010 | 10649 | 10 |
| 2009 | 10848 | 10 |
| 2008 | 11884 | 9 |
| 2007 | 8215 | 15 |
| 2006 | 6196 | 21 |
| 2005 | 6926 | 17 |
| 2004 | 5812 | 21 |
| 2003 | 8149 | 13 |
| 2002 | 6807 | 16 |
| 2001 | 14127 | 6 |
| 2000 | 10174 | 9 |
| 1999 | 9024 | 10 |
| 1998 | 14964 | 5 |
| 1997 | 10130 | 8 |
| 1996 | 10977 | 7 |
| 1994 | 10954 | 7 |
| 1993 | 9887 | 8 |
| 1991 | 10680 | 7 |