| Year | Rank | Number |
| 2011 | 2759 | 43 |
| 2010 | 2222 | 59 |
| 2009 | 2530 | 50 |
| 2008 | 2492 | 51 |
| 2007 | 2631 | 47 |
| 2006 | 2815 | 41 |
| 2005 | 2454 | 47 |
| 2004 | 2444 | 46 |
| 2003 | 1955 | 60 |
| 2002 | 2361 | 44 |
| 2001 | 1626 | 73 |
| 2000 | 1603 | 74 |
| 1999 | 1876 | 53 |
| 1998 | 1284 | 94 |
| 1997 | 1484 | 72 |
| 1996 | 1836 | 50 |
| 1995 | 1829 | 48 |
| 1994 | 2669 | 28 |
| 1993 | 2493 | 30 |
| 1992 | 2656 | 27 |
| 1991 | 2392 | 30 |
| 1990 | 4631 | 12 |
| 1989 | 6825 | 7 |
| 1988 | 4726 | 10 |
| 1987 | 5375 | 8 |
| 1986 | 7659 | 5 |