1908-Today Yearbooks available here:

http://www.abs.gov.au/AUSSTATS/abs@.nsf/second+level+view?ReadForm&prodno=1301.0&viewtitle=Year%20Book%20Australia~1931~Previous~01/01/1931&&tabname=Past%20Future%20Issues&prodno=1301.0&issue=1931&num=&view=&

8 July 2012: So far I only download various 1960s-1970s chapters on Public Finance, in order to get 1960-1970 estimates of the net public debt outstanding