| Year | Rank | Number |
| 2011 | 2736 | 63 |
| 2010 | 2904 | 59 |
| 2009 | 3108 | 54 |
| 2008 | 2744 | 66 |
| 2007 | 2370 | 80 |
| 2006 | 4013 | 37 |
| 2005 | 5862 | 21 |
| 2004 | 4308 | 32 |
| 2003 | 5277 | 23 |
| 2002 | 6475 | 17 |
| 2001 | 7432 | 14 |
| 2000 | 9368 | 10 |
| 1999 | 13169 | 6 |
| 1998 | 14861 | 5 |
| 1997 | 9251 | 9 |
| 1995 | 9853 | 8 |
| 1991 | 13801 | 5 |
| 1978 | 8848 | 6 |
| 1954 | 5318 | 6 |
| 1929 | 4782 | 5 |
| 1921 | 4638 | 6 |