The BIS has released their latest dataset on long term residential price trends. Australia figures near the top, ahead of NZ, US and UK, but behind Norway and Sweden.
But for those convinced prices can only go up, look at Japan (lower now than in 1999), Ireland, (peak in 2008, but now much lower) and Hong Kong (often cited as the most expensive market, but fallen recently). Property can go down as well as up!
How much longer will prices here defy gravity?