I got this from one website.
Cost of Living
From 1 January 2010, the basic rate of living costs increased from the previous rate of Australian Dollars (AUD) 12000 per year.
AUD $18,000 per year the husband
AUD $6,300 per year for the spouse
AUD $3,600 per year for the first child
AUD $2,700 per year for every other child