Age of respondents by year of survey (N = 8305)
| Year of survey | |||||||
| 1996 | 1999 | 2000 | 2002a | 2002b | 2003 | 2005 | |
| N = 2097 | N = 2125 | N = 652 | N = 1468 | N = 262 | N = 230 | N = 1471 | |
| N (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | |
| Age group, years | |||||||
| <25 | 475 (22.7) | 479 (22.5) | 173 (26.5) | 438 (29.8) | 82 (31.3) | 43 (18.7) | 400 (27.2) |
| 25–34 | 1010 (48.2) | 942 (44.3) | 263 (40.3) | 567 (38.6) | 96 (36.6) | 77 (33.5) | 488 (33.2) |
| 35–44 | 455 (21.7) | 504 (23.7) | 161 (24.7) | 366 (24.9) | 63 (24.0) | 77 (33.5) | 407 (27.7) |
| >44 | 157 (7.5) | 200 (9.4) | 55 (8.4) | 97 (6.6) | 21 (8.0) | 33 (14.3) | 176 (12.0) |