| Year | Rank | Number |
| 2011 | 7798 | 15 |
| 2010 | 5604 | 24 |
| 2009 | 4654 | 31 |
| 2008 | 6128 | 22 |
| 2007 | 6110 | 22 |
| 2006 | 4813 | 29 |
| 2005 | 8367 | 13 |
| 2004 | 5576 | 22 |
| 2003 | 9105 | 11 |
| 2001 | 8243 | 12 |
| 2000 | 9968 | 9 |
| 1998 | 14352 | 5 |
| 1995 | 13612 | 5 |
| 1992 | 13464 | 5 |
| 1991 | 11630 | 6 |
| 1983 | 10377 | 5 |
| 1982 | 8281 | 7 |
| 1976 | 9363 | 5 |
| Year | Rank | Number |
| 2011 | 7798 | 15 |
| 2010 | 5604 | 24 |
| 2009 | 4654 | 31 |
| 2008 | 6128 | 22 |
| 2007 | 6110 | 22 |
| 2006 | 4813 | 29 |
| 2005 | 8367 | 13 |
| 2004 | 5576 | 22 |
| 2003 | 9105 | 11 |
| 2001 | 8243 | 12 |
| 2000 | 9968 | 9 |
| 1998 | 14352 | 5 |
| 1995 | 13612 | 5 |
| 1992 | 13464 | 5 |
| 1991 | 11630 | 6 |
| 1983 | 10377 | 5 |
| 1982 | 8281 | 7 |
| 1976 | 9363 | 5 |