| Year | Rank | Number |
| 2011 | 11491 | 9 |
| 2010 | 10013 | 11 |
| 2008 | 13032 | 8 |
| 2007 | 11996 | 9 |
| 2006 | 12822 | 8 |
| 2005 | 11248 | 9 |
| 2004 | 8437 | 13 |
| 2003 | 8181 | 13 |
| 2002 | 5971 | 19 |
| 2001 | 6157 | 18 |
| 2000 | 5561 | 20 |
| 1999 | 10728 | 8 |
| 1998 | 5222 | 20 |
| 1997 | 6609 | 14 |
| 1996 | 3978 | 27 |
| 1995 | 3443 | 32 |
| 1994 | 3476 | 32 |
| 1993 | 3531 | 31 |
| 1992 | 2652 | 46 |
| 1991 | 2999 | 38 |
| 1990 | 2157 | 60 |
| 1989 | 2347 | 50 |
| 1988 | 2377 | 46 |