| Year | Rank | Number |
| 2011 | 2289 | 56 |
| 2010 | 2301 | 56 |
| 2009 | 2628 | 47 |
| 2008 | 1987 | 71 |
| 2007 | 2150 | 63 |
| 2006 | 2334 | 54 |
| 2005 | 2022 | 62 |
| 2004 | 2724 | 39 |
| 2003 | 2167 | 51 |
| 2002 | 2213 | 48 |
| 2001 | 2765 | 34 |
| 2000 | 3859 | 21 |
| 1999 | 2988 | 28 |
| 1998 | 3947 | 18 |
| 1997 | 4844 | 13 |
| 1996 | 5803 | 10 |
| 1995 | 3785 | 17 |
| 1994 | 5306 | 11 |
| 1993 | 4365 | 14 |
| 1992 | 8051 | 6 |
| 1991 | 7868 | 6 |