| Year | Rank | Number |
| 2011 | 2656 | 66 |
| 2010 | 2493 | 74 |
| 2009 | 2001 | 102 |
| 2008 | 2074 | 98 |
| 2007 | 1967 | 104 |
| 2006 | 2643 | 68 |
| 2005 | 2094 | 89 |
| 2004 | 2370 | 72 |
| 2003 | 2376 | 70 |
| 2002 | 2794 | 54 |
| 2001 | 2668 | 56 |
| 2000 | 3414 | 39 |
| 1999 | 3120 | 42 |
| 1998 | 2900 | 45 |
| 1997 | 3476 | 33 |
| 1996 | 3382 | 34 |
| 1995 | 4737 | 21 |
| 1994 | 3477 | 32 |
| 1993 | 3452 | 32 |
| 1992 | 3443 | 32 |
| 1991 | 3322 | 33 |
| 1990 | 3174 | 35 |
| 1989 | 2947 | 37 |
| 1988 | 2891 | 36 |
| 1987 | 11981 | 5 |