| Up to 70 | 50 - 69 | 15 - 49 | 5 - 14 | 1 - 4 | Under 1 | Years |
| 61.1 | 75.2 | 72.1 | 68.7 | 51.4 | 33.5 | 2006 |
| 56.2 | 71.2 | 69.1 | 62.9 | 49.9 | 35.5 | 2007 |
| 59.6 | 72.3 | 68.2 | 64.1 | 48.6 | 39.1 | 2008 |
| 59.3 | 74.1 | 70.4 | 64.7 | 53.8 | 36.9 | 2009 |
| 54.6 | 70.9 | 67.9 | 65.1 | 51.2 | 39.9 | 2010 |