| Year | Rank | Number |
| 2011 | 6570 | 19 |
| 2010 | 5793 | 23 |
| 2009 | 5519 | 25 |
| 2008 | 4359 | 35 |
| 2007 | 3380 | 49 |
| 2006 | 3565 | 44 |
| 2005 | 3368 | 45 |
| 2004 | 3221 | 47 |
| 2003 | 5262 | 23 |
| 2002 | 3736 | 35 |
| 2001 | 4116 | 30 |
| 2000 | 5003 | 23 |
| 1999 | 3899 | 30 |
| 1998 | 7173 | 13 |
| 1997 | 12327 | 6 |
| 1996 | 8249 | 10 |
| 1995 | 12011 | 6 |
| 1994 | 8922 | 9 |
| 1993 | 13771 | 5 |
| 1984 | 8255 | 7 |