| Year | Rank | Number |
| 2011 | 10912 | 10 |
| 2010 | 14561 | 7 |
| 2009 | 19343 | 5 |
| 2008 | 9339 | 13 |
| 2007 | 8863 | 14 |
| 2006 | 11194 | 10 |
| 2005 | 12714 | 8 |
| 2004 | 18100 | 5 |
| 2003 | 17707 | 5 |
| 2002 | 17445 | 5 |
| 2001 | 14861 | 6 |
| Year | Rank | Number |
| 2011 | 10912 | 10 |
| 2010 | 14561 | 7 |
| 2009 | 19343 | 5 |
| 2008 | 9339 | 13 |
| 2007 | 8863 | 14 |
| 2006 | 11194 | 10 |
| 2005 | 12714 | 8 |
| 2004 | 18100 | 5 |
| 2003 | 17707 | 5 |
| 2002 | 17445 | 5 |
| 2001 | 14861 | 6 |