The 2004/5 master plan says that in 1988 when the FAC took control of the airport annual movements were over 400000.
The History of Bankstown Airport found here
http://www.lockoweb.com/Final%20Draft.htm#_Toc243020835
states that in the early 1980's there were 460 aircraft based there. My guess is there would only be 150-200 (at best) aircraft currently based there.
Also found in an old aviation mag, that Jandakot had 325000 movements in 1989.