| Year | Rank | Number |
| 2011 | 1008 | 247 |
| 2010 | 987 | 255 |
| 2009 | 1065 | 237 |
| 2008 | 1148 | 223 |
| 2007 | 1375 | 175 |
| 2006 | 1326 | 176 |
| 2005 | 1265 | 177 |
| 2004 | 1625 | 119 |
| 2003 | 1541 | 125 |
| 2002 | 1820 | 98 |
| 2001 | 1993 | 85 |
| 2000 | 1996 | 83 |
| 1999 | 2308 | 64 |
| 1998 | 2083 | 70 |
| 1997 | 2822 | 43 |
| 1996 | 3435 | 33 |
| 1995 | 4681 | 21 |
| 1994 | 3450 | 32 |
| 1993 | 7065 | 12 |
| 1992 | 6033 | 15 |
| 1991 | 4661 | 21 |