Leg, did you ever look at the Aus. Bureau of Statistics for info? I ask because I have only just found their downloads page for their yearbooks of the state of the nation.
While the docs give overviews, projects and stats such as total number of personnel, they don't go into any finer detail so they may not be that helpful?
This is the page for the 1990 yearbook
https://www.abs.gov.au/AUSSTATS/abs@...0?OpenDocument
And the specific pdf for the section on Defence
https://www.ausstats.abs.gov.au/ausstats/free.nsf/0/EA1A5CACAA16D17BCA25739C0008D1E6/$File/13010_1990_chapter4.pdf
I found it wasn't to much mucking about to get the various years by using "year book Australia 1990" in the search box (or whatever other year you wanted to check) so for example, here's the downloads page for 1995
https://www.abs.gov.au/AUSSTATS/abs@...5?OpenDocument