Oak Flats is a suburb of Shellharbour, New South Wales, Australia situated on the south western shores of Lake Illawarra and within the South Coast region of New South Wales. It is a residential area, which had a population of 6,415 at the 2016 census .
Oak Flats had a population of 6415 at the 2015 census
It is not stated what Oak Flats' population in 2015 was. I think the system got it wrong because changing the year makes it difficult to analyze