| Year | Rank | Number |
| 2011 | 3646 | 42 |
| 2010 | 3809 | 40 |
| 2009 | 3650 | 43 |
| 2008 | 3640 | 44 |
| 2007 | 3779 | 42 |
| 2006 | 3670 | 42 |
| 2005 | 5109 | 25 |
| 2004 | 5749 | 21 |
| 2003 | 8020 | 13 |
| 2002 | 8316 | 12 |
| 2001 | 6338 | 17 |
| 2000 | 9206 | 10 |
| 1999 | 12797 | 6 |
| 1998 | 11201 | 7 |
| 1997 | 8372 | 10 |
| 1996 | 10632 | 7 |
| 1994 | 11852 | 6 |
| 1993 | 10654 | 7 |
| 1992 | 11809 | 6 |
| 1991 | 5958 | 15 |
| 1990 | 10247 | 7 |
| 1989 | 10909 | 6 |
| 1986 | 10958 | 5 |
| 1984 | 10475 | 5 |