| Year | Rank | Number |
| 2011 | 2546 | 48 |
| 2010 | 2520 | 49 |
| 2009 | 2444 | 52 |
| 2008 | 2845 | 42 |
| 2007 | 2321 | 56 |
| 2006 | 2426 | 51 |
| 2005 | 2545 | 44 |
| 2004 | 2365 | 48 |
| 2003 | 2140 | 52 |
| 2002 | 2392 | 43 |
| 2001 | 2655 | 36 |
| 2000 | 2708 | 34 |
| 1999 | 2492 | 36 |
| 1998 | 3655 | 20 |
| 1997 | 3537 | 20 |
| 1996 | 2457 | 32 |
| 1995 | 3507 | 19 |
| 1994 | 4014 | 16 |
| 1993 | 3938 | 16 |
| 1992 | 4725 | 12 |
| 1991 | 4949 | 11 |
| 1990 | 7675 | 6 |
| 1989 | 7486 | 6 |
| 1988 | 7964 | 5 |
| 1987 | 6577 | 6 |
| 1985 | 7109 | 5 |
| 1983 | 6821 | 5 |
| 1977 | 5517 | 6 |
| 1974 | 4962 | 6 |