| Year | Rank | Number |
| 2011 | 8448 | 14 |
| 2010 | 9057 | 13 |
| 2009 | 8264 | 15 |
| 2008 | 16804 | 6 |
| 2007 | 16940 | 6 |
| 2006 | 13216 | 8 |
| 2005 | 12655 | 8 |
| 2003 | 13403 | 7 |
| 2002 | 17312 | 5 |
| 2001 | 13041 | 7 |
| 2000 | 12732 | 7 |
| 1999 | 8619 | 11 |
| 1998 | 9856 | 9 |
| 1996 | 10233 | 8 |
| 1991 | 12582 | 6 |
| Year | Rank | Number |
| 2011 | 8448 | 14 |
| 2010 | 9057 | 13 |
| 2009 | 8264 | 15 |
| 2008 | 16804 | 6 |
| 2007 | 16940 | 6 |
| 2006 | 13216 | 8 |
| 2005 | 12655 | 8 |
| 2003 | 13403 | 7 |
| 2002 | 17312 | 5 |
| 2001 | 13041 | 7 |
| 2000 | 12732 | 7 |
| 1999 | 8619 | 11 |
| 1998 | 9856 | 9 |
| 1996 | 10233 | 8 |
| 1991 | 12582 | 6 |