Aus Population 25m
Japan Pop 127m
US pop 327m
CHina Pop 1,415m
At your rate of around 800,000 for Australia per annum this produces 60,000,000 in total for all the above
Interestingly Japan would be producing 4,000,000 pa on that basis so I would suggest that the miniscule Australian market is actually doing quite well even with those figures.