Year |
| Everyday | 3 - 6 times/week | 1 - 2 times/week | 2 - 3 times/month | 1 time/month | <1 time/month |
2003 | n % | 418 (3.5) | 3490 (29) | 4682 (38.9) | 2528 (21) | 697 (5.8) | 224 (1.9) |
2005 | n % | 465 (3.8) | 4916 (40.2) | 4579 (37.5) | 1727 (14.1) | 379 (3.1) | 155 (1.3) |
2007 | n % | 576 (4.5) | 6199 (48.6) | 4545 (35.7) | 1199 (9.4) | 165 (1.3) | 63 (0.5) |
2009 | n % | 288 (2.2) | 6477 (50.2) | 4475 (34.7) | 1320 (10.2) | 258 (2) | 98 (0.8) |
2011 | n % | 345 (2.7) | 6016 (46.3) | 5059 (38.9) | 1303 (10) | 226 (1.7) | 53 (0.4) |
2013 | n % | 346 (2.7) | 6011 (46.3) | 5052 (38.9) | 1298 (10) | 229 (1.8) | 52 (0.4) |