| Year | Rank | Number |
| 2011 | 13530 | 5 |
| 2010 | 6242 | 14 |
| 2009 | 6240 | 14 |
| 2008 | 6620 | 13 |
| 2007 | 5120 | 18 |
| 2006 | 4790 | 19 |
| 2005 | 6934 | 11 |
| 2004 | 4529 | 19 |
| 2003 | 3801 | 23 |
| 2002 | 5610 | 13 |
| 2001 | 4226 | 19 |
| 2000 | 3486 | 24 |
| 1999 | 4096 | 18 |
| 1998 | 5347 | 12 |
| 1997 | 5161 | 12 |
| 1996 | 8621 | 6 |
| 1995 | 5001 | 12 |
| 1994 | 5739 | 10 |
| 1993 | 9649 | 5 |