The share of Christians actually dropped by a greater amount - 61 to 52 per cent over the same time frame.
The group of Catholics declined from 25 to 23 per cent, Anglicans from 17 to 13 per cent and each of the minor Christian denominations also recorded reductions.
But non-Christian religions actually grew in their share of the population, from 7 to 8 per cent due to small increases across Islam, Hinduism and Sikhism.
