| Age/year | 1971 | 1980 | 1985-86 | 1990 | 1995-96 | 2000 | 2010 |
| 0 - 9 yo | 44.8 | 33.7 | 27.3 | 23.0 | 20.2 | 18.3 | 17.5 |
| 10 - 19 | 62.2 | 51.1 | 44.7 | 38.8 | 36.0 | 30.0 | 30.6 |
| 20 - 29 | 67.8 | 56.1 | 52.5 | 45.5 | 46.2 | 40.8 | 37.6 |
| 30 - 39 | 68.5 | 65.6 | 60.2 | 54.3 | 52.3 | 49.8 | 45.7 |
| 40 - 49 | 77.4 | 80.3 | 78.2 | 71.7 | 67.3 | 62.0 | 54.7 |
| 50 - 59 | 89.0 | 90.5 | 91.9 | 84.0 | 83.7 | 82.3 | 66.2 |
| 60 - 69 | 87.5 | 93.3 | 99.0 | 91.2 | 91.0 | 94.0 | 80.8 |
| 70+ | 71.0 | 80.0 | 89.4 | 80.1 | 81.3 | 86.9 | 81.5 |
| Grand ave. | 67.1 | 63.6 | 62.4 | 58.3 | 59.0 | 57.2 | 55.4 |