My count of hits by Australian artists in the Melbourne Top 40 Record Charts 1960-89, based on the material in Guest, Thomas J. (1991). Thirty Years of Hits. Collingwood, Melbourne: M. J. Maloney. ISBN 0-646-04633-0.
Done for my Masters thesis at the University of Melbourne in 1992, which was later published as Groenewegen, D., (1997) The Real Thing’? The Rock Music Industry and the Creation of Australian Images 1958-87, Moonlight Press, Melbourne.
I had quite strong views on what an "Australian" artist was at the time, so artists such as the Bee Gees and Olivia Newton-John are not included. This might make it difficult to replicate the data if you use the same very manual process.