| Year | Rank | Number |
| 2011 | 10478 | 7 |
| 2010 | 8628 | 9 |
| 2009 | 10655 | 7 |
| 2007 | 10641 | 7 |
| 2006 | 7311 | 11 |
| 2005 | 6529 | 12 |
| 2004 | 8032 | 9 |
| 2003 | 7704 | 9 |
| 2002 | 4857 | 16 |
| 2001 | 5935 | 12 |
| 2000 | 4030 | 20 |
| 1999 | 4974 | 14 |
| 1998 | 4161 | 17 |
| 1997 | 7136 | 8 |
| 1996 | 5115 | 12 |
| 1995 | 6852 | 8 |
| 1994 | 9954 | 5 |
| 1991 | 7127 | 7 |
| 1990 | 5714 | 9 |
| 1989 | 7711 | 6 |