| Year | Rank | Number |
| 2011 | 3531 | 44 |
| 2010 | 4747 | 30 |
| 2009 | 5076 | 28 |
| 2008 | 5455 | 26 |
| 2007 | 5259 | 27 |
| 2006 | 6621 | 19 |
| 2005 | 7211 | 16 |
| 2004 | 7471 | 15 |
| 2003 | 5625 | 21 |
| 2002 | 9651 | 10 |
| 2001 | 7040 | 15 |
| 2000 | 7667 | 13 |
| 1999 | 7827 | 12 |
| 1998 | 7647 | 12 |
| 1997 | 11115 | 7 |
| 1996 | 8294 | 10 |
| 1995 | 8930 | 9 |
| 1972 | 4569 | 12 |
| 1969 | 6071 | 7 |
| 1965 | 3573 | 13 |