I was doing my research on this pair, and noticed good match up with the Fib retracement. The start high price is 1.4885 which happened to be somewhere around 1976. The lowest price was 0.4829 somewhere in 2001. Between 2001 and 2014 USD was weak and retracted to 1.10xx area which align with 0.382 fib level.
Since then we see continuation of the general downtrend. Applying fibo extension shows levels of $AUDUSD 0.20xxx and 0.066xx.
Please do your own research, use Stop Loss or hedge to trade