| Year | Rank | Number |
| 2011 | 4635 | 20 |
| 2010 | 5034 | 18 |
| 2009 | 6748 | 12 |
| 2008 | 3813 | 27 |
| 2007 | 3022 | 38 |
| 2006 | 3683 | 27 |
| 2003 | 10961 | 5 |
| 2002 | 10737 | 5 |
| 2001 | 9285 | 6 |
| 1988 | 7309 | 5 |
| 1983 | 5496 | 6 |
| 1980 | 5544 | 6 |
| 1977 | 4172 | 8 |
| 1974 | 5244 | 5 |
| 1972 | 4461 | 6 |
| Year | Rank | Number |
| 2011 | 4635 | 20 |
| 2010 | 5034 | 18 |
| 2009 | 6748 | 12 |
| 2008 | 3813 | 27 |
| 2007 | 3022 | 38 |
| 2006 | 3683 | 27 |
| 2003 | 10961 | 5 |
| 2002 | 10737 | 5 |
| 2001 | 9285 | 6 |
| 1988 | 7309 | 5 |
| 1983 | 5496 | 6 |
| 1980 | 5544 | 6 |
| 1977 | 4172 | 8 |
| 1974 | 5244 | 5 |
| 1972 | 4461 | 6 |