| Year | Rank | Number |
| 2011 | 12183 | 8 |
| 2010 | 9806 | 11 |
| 2009 | 12441 | 8 |
| 2008 | 10108 | 11 |
| 2007 | 10159 | 11 |
| 2006 | 9328 | 12 |
| 2005 | 6541 | 18 |
| 2004 | 7100 | 16 |
| 2003 | 5816 | 20 |
| 2002 | 7066 | 15 |
| 2001 | 7345 | 14 |
| 2000 | 4655 | 25 |
| 1999 | 6210 | 16 |
| 1998 | 4965 | 21 |
| 1997 | 6508 | 14 |
| 1996 | 8186 | 10 |
| 1995 | 6275 | 14 |
| 1994 | 5025 | 19 |
| 1993 | 11865 | 6 |