| Year | Rank | Number |
| 2011 | 3791 | 27 |
| 2010 | 3731 | 28 |
| 2009 | 4036 | 25 |
| 2008 | 4437 | 22 |
| 2007 | 4855 | 19 |
| 2006 | 3459 | 30 |
| 2005 | 4520 | 19 |
| 2004 | 4307 | 20 |
| 2003 | 3876 | 22 |
| 2002 | 3379 | 26 |
| 2001 | 4959 | 15 |
| 2000 | 4859 | 15 |
| 1999 | 4044 | 18 |
| 1998 | 4725 | 14 |
| 1997 | 6812 | 8 |
| 1996 | 6698 | 8 |
| 1995 | 5249 | 11 |
| 1993 | 9195 | 5 |
| 1983 | 6582 | 5 |
| 1980 | 5760 | 6 |
| 1979 | 6371 | 5 |
| 1978 | 4696 | 7 |
| 1976 | 5888 | 5 |
| 1973 | 3816 | 8 |