| Year | Rank | Number |
| 2011 | 9547 | 12 |
| 2010 | 7145 | 18 |
| 2009 | 7932 | 16 |
| 2008 | 6501 | 21 |
| 2007 | 6034 | 23 |
| 2006 | 4917 | 29 |
| 2005 | 5215 | 25 |
| 2004 | 5175 | 25 |
| 2003 | 5057 | 25 |
| 2002 | 4869 | 25 |
| 2001 | 5526 | 21 |
| 2000 | 5656 | 20 |
| 1999 | 12414 | 7 |
| 1998 | 9145 | 10 |
| 1997 | 11841 | 7 |
| 1996 | 13159 | 6 |
| 1995 | 13052 | 6 |
| 1994 | 15269 | 5 |
| 1993 | 13107 | 6 |
| 1992 | 10275 | 8 |