Forty one years from now

"The bureau's projections have Melbourne doubling in population to reach 8.163 million by 2056, making it slightly bigger than Sydney. Perth would become Australia's third biggest city with 5.1 million, eclipsing Brisbane with 4.5 million. Adelaide would have 1.9 million, Canberra 700,000, Hobart 268,000 and Darwin 216,000."

http://www.smh.com.au/federal-polit...stralias-no1-destination-20150326-1m8mze.html

Perth is going to be the third biggest city in the country.  They have energy and water challenges now, imagine what it will be like when the population trebles?