| Year | Rank | Number |
| 2011 | 718 | 383 |
| 2010 | 936 | 275 |
| 2009 | 1276 | 189 |
| 2008 | 1448 | 162 |
| 2007 | 1872 | 112 |
| 2006 | 2094 | 93 |
| 2005 | 1742 | 113 |
| 2004 | 2453 | 69 |
| 2003 | 2420 | 68 |
| 2002 | 2505 | 63 |
| 2001 | 2575 | 59 |
| 2000 | 3232 | 42 |
| 1999 | 2078 | 74 |
| 1998 | 3679 | 32 |
| 1997 | 8641 | 10 |
| 1996 | 11091 | 7 |
| 1995 | 4267 | 24 |
| 1986 | 11686 | 5 |