| Gender | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | |
| Total | 1,785 | 1,879 | 2,177 | 3,005 | 3,663 | 4,270 | 4,201 | 4,152 | 4,141 | 4,225 |
| Female | 814 | 869 | 1,024 | 1,356 | 1,587 | 1,873 | 1,903 | 1,818 | 1,831 | 1,785 |
| Male | 971 | 1,010 | 1,153 | 1,649 | 2,076 | 2,397 | 2,298 | 2,334 | 2,310 | 2,440 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| Female | 45.6% | 46.2% | 47.0% | 45.1% | 43.3% | 43.9% | 45.3% | 43.8% | 44.2% | 42.2% |
| Male | 54.4% | 53.8% | 53.0% | 54.9% | 56.7% | 56.1% | 54.7% | 56.2% | 55.8% | 57.8% |