The graph shows the nominal median house prices in each of the capital cities in March 1980, and March 201 in Australia. The prices of houses have increased dramatically since 1980. In 1980, prices were stable compared to the prices in 2016 being a bit erratic. It has been an enormous increase in prices in Sydney and Melbourne when we compare them with other capital cities.
In conclusion, housing prices have been going up but housing affordability has been going down year by year in Australia.