As of today, it's lost 29% of its value since July. I suppose parity with the US$ was too good to last.
Apparently, in uncertain economic times, money markets retreat into 'safe harbour' currencies, like the Yen. the A$, apparently, is not one of these, since we have a commodity-based economy.
Just by way of comparison, the Aussie $ has lost more of its value that the Mexican peso and the Brazilian real.