| Estimation Period | <15 | 15 - 64 | 65+ | Ageing Index |
| 1971* | 47.5 | 46.9 | 5.6 | 13.0 |
| 1981 | 47.6 | 47.6 | 5.1 | 11.8 |
| 1991 | 43.2 | 51.5 | 4.9 | 12.5 |
| 2001 | 36.6 | 58.2 | 5.0 | 15.0 |
| 2011 | 32.6 | 62.4 | 5.0 | 16.9 |