| Year | Rank | Number |
| 2011 | 3924 | 26 |
| 2010 | 4294 | 23 |
| 2009 | 7392 | 11 |
| 2008 | 5900 | 15 |
| 2007 | 5306 | 17 |
| 2006 | 12978 | 5 |
| 2005 | 9608 | 7 |
| 2004 | 8522 | 8 |
| 2003 | 6052 | 12 |
| 2000 | 8659 | 7 |
| 1999 | 9288 | 6 |
| 1998 | 9043 | 6 |
| 1996 | 8451 | 6 |
| 1995 | 9579 | 5 |
| 1990 | 5584 | 9 |
| 1989 | 8549 | 5 |
| 1988 | 7882 | 5 |
| Year | Rank | Number |
| 2011 | 3924 | 26 |
| 2010 | 4294 | 23 |
| 2009 | 7392 | 11 |
| 2008 | 5900 | 15 |
| 2007 | 5306 | 17 |
| 2006 | 12978 | 5 |
| 2005 | 9608 | 7 |
| 2004 | 8522 | 8 |
| 2003 | 6052 | 12 |
| 2000 | 8659 | 7 |
| 1999 | 9288 | 6 |
| 1998 | 9043 | 6 |
| 1996 | 8451 | 6 |
| 1995 | 9579 | 5 |
| 1990 | 5584 | 9 |
| 1989 | 8549 | 5 |
| 1988 | 7882 | 5 |