| Gender | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
| Total | 4,226 | 4,610 | 5,355 | 6,034 | 8,038 | 11,851 | 15,399 | 19,216 | 22,924 | 25,465 |
| Female | 1,799 | 1,959 | 2,333 | 2,557 | 3,457 | 4,945 | 6,398 | 8,039 | 9,764 | 10,784 |
| Male | 2,427 | 2,651 | 3,022 | 3,477 | 4,581 | 6,906 | 9,001 | 11,177 | 13,160 | 14,681 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| Female | 42.6% | 42.5% | 43.6% | 42.4% | 43.0% | 41.7% | 41.5% | 41.8% | 42.6% | 42.3% |
| Male | 57.4% | 57.5% | 56.4% | 57.6% | 57.0% | 58.3% | 58.5% | 58.2% | 57.4% | 57.7% |