I'm a lazy sod so can't be bovered looking up the figures but........Bankstown is an example of the decline in GA. Now compared to 70's, 80's?
I disagree with Turbo's optimistic rosy view of GA and that CASA staff are keen flying enthusiasts. (Turbo, you employed by CASA or an ex CASA employee?) I've been flying professionally for 40 years and have had my own aviation business and been chief pilot for several others, in 40 years I can only think of one positive experience with CASA. Others I fly with have the same experience. Any rural town in Eastern Oz walk outside and listen, 70's and 80's you would always hear an aircraft. I might hear one 3 times a year now.
Over-complication of regs, unnecessary changes in licensing and compliance for no reason, take Part 61 licence as an example. Read the prune thread with Glenn Buckley as to an example of CASA's treatment of GA.
CASA moto......"We're not happy till your not happy" is the joke line, if it wasn't so true it would be funny.