The census data for 2016 has been released as of 27 June 2017, and is available in breakdowns from Census DataPacks. And the Australian Bureau of Statistics loves their Microsoft Excel.
It isn’t immediately obvious from the zip file what’s going on, but with perseverance, it turns out that 162,103 people from the Greater Melbourne Area claim Greek ancestry, and 36,758 of them have both parents born in Australia.