| Year | Rank | Number |
| 2011 | 4389 | 22 |
| 2010 | 3032 | 38 |
| 2009 | 3564 | 30 |
| 2008 | 4068 | 25 |
| 2007 | 3628 | 29 |
| 2006 | 3257 | 33 |
| 2005 | 3979 | 23 |
| 2004 | 4486 | 19 |
| 2003 | 4903 | 16 |
| 2002 | 4239 | 19 |
| 2001 | 4196 | 19 |
| 2000 | 4886 | 15 |
| 1999 | 4440 | 16 |
| 1998 | 4281 | 16 |
| 1997 | 9929 | 5 |
| 1996 | 7482 | 7 |
| 1994 | 9455 | 5 |
| 1993 | 9356 | 5 |
| 1989 | 8461 | 5 |