<1 hour | 1–2 hours | 2–3 hours | >3 hours | Not known | |
---|---|---|---|---|---|
1995–96 | 74 435 (76%) | 17 139 (17.5%) | 3624 (3.7%) | 1175 (1.2%) | 1567 (1.6%) |
1996–97 | 73 326 (74%) | 17 638 (17.8%) | 4558 (4.6%) | 1387 (1.4%) | 2180 (2.2%) |
1997–98 | 62 496 (71%) | 17 428 (19.8%) | 3873 (4.4%) | 1144 (1.3%) | 3081 (3.5%) |