| Year | Rank | Number |
| 2011 | 1741 | 117 |
| 2010 | 2167 | 90 |
| 2009 | 2471 | 76 |
| 2008 | 2749 | 66 |
| 2007 | 4155 | 37 |
| 2006 | 4098 | 36 |
| 2005 | 5016 | 26 |
| 2004 | 4320 | 32 |
| 2003 | 5154 | 24 |
| 2002 | 4685 | 26 |
| 2001 | 6457 | 17 |
| 2000 | 6622 | 16 |
| 1999 | 5316 | 20 |
| 1998 | 6182 | 16 |
| 1997 | 14774 | 5 |
| 1996 | 11092 | 7 |
| 1995 | 12464 | 6 |
| 1993 | 14469 | 5 |