| Year | Rank | Number |
| 2011 | 3353 | 48 |
| 2010 | 3425 | 47 |
| 2009 | 3458 | 47 |
| 2008 | 3171 | 53 |
| 2007 | 3265 | 52 |
| 2006 | 2924 | 59 |
| 2005 | 2505 | 69 |
| 2004 | 2867 | 56 |
| 2003 | 2748 | 57 |
| 2002 | 2453 | 65 |
| 2001 | 1536 | 121 |
| 2000 | 2520 | 60 |
| 1999 | 3020 | 44 |
| 1998 | 3256 | 38 |
| 1997 | 4064 | 27 |
| 1996 | 6904 | 13 |
| 1995 | 5554 | 17 |
| 1994 | 4166 | 25 |
| 1993 | 6424 | 14 |
| 1992 | 7759 | 11 |
| 1991 | 7651 | 11 |
| 1990 | 9660 | 8 |