| Year | Rank | Number |
| 2011 | 9337 | 12 |
| 2010 | 8924 | 13 |
| 2009 | 9583 | 12 |
| 2008 | 8694 | 14 |
| 2007 | 7215 | 18 |
| 2006 | 8455 | 14 |
| 2005 | 6110 | 20 |
| 2004 | 7586 | 15 |
| 2003 | 4858 | 26 |
| 2002 | 5152 | 23 |
| 2001 | 6777 | 16 |
| 2000 | 6319 | 17 |
| 1999 | 6037 | 17 |
| 1998 | 7306 | 13 |
| 1997 | 4171 | 26 |
| 1996 | 3985 | 27 |
| 1995 | 3118 | 37 |
| 1994 | 5114 | 19 |
| 1993 | 9062 | 9 |