| Year | Rank | Number |
| 2011 | 1243 | 191 |
| 2010 | 1420 | 161 |
| 2009 | 1377 | 171 |
| 2008 | 1770 | 125 |
| 2007 | 2040 | 100 |
| 2006 | 2686 | 67 |
| 2005 | 2446 | 72 |
| 2004 | 2411 | 71 |
| 2003 | 2865 | 54 |
| 2002 | 4250 | 30 |
| 2001 | 3614 | 37 |
| 2000 | 3438 | 39 |
| 1999 | 6753 | 15 |
| 1998 | 13696 | 6 |
| 1997 | 13295 | 6 |
| 1994 | 15103 | 5 |
| 1989 | 11918 | 6 |
| 1978 | 10948 | 5 |