| Year | Rank | Number |
| 2011 | 6558 | 12 |
| 2010 | 8814 | 8 |
| 2009 | 8248 | 9 |
| 2008 | 5746 | 15 |
| 2007 | 5197 | 17 |
| 2006 | 5298 | 16 |
| 2005 | 5283 | 15 |
| 2004 | 5822 | 13 |
| 2003 | 7261 | 9 |
| 2002 | 4911 | 15 |
| 2001 | 7543 | 8 |
| 2000 | 9138 | 6 |
| 1999 | 8745 | 6 |
| 1998 | 8510 | 6 |
| 1994 | 7802 | 6 |
| 1991 | 8271 | 5 |
| 1990 | 6428 | 7 |
| Year | Rank | Number |
| 2011 | 6558 | 12 |
| 2010 | 8814 | 8 |
| 2009 | 8248 | 9 |
| 2008 | 5746 | 15 |
| 2007 | 5197 | 17 |
| 2006 | 5298 | 16 |
| 2005 | 5283 | 15 |
| 2004 | 5822 | 13 |
| 2003 | 7261 | 9 |
| 2002 | 4911 | 15 |
| 2001 | 7543 | 8 |
| 2000 | 9138 | 6 |
| 1999 | 8745 | 6 |
| 1998 | 8510 | 6 |
| 1994 | 7802 | 6 |
| 1991 | 8271 | 5 |
| 1990 | 6428 | 7 |