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Because we have a iirc 19000 refugee intake thing from the UN and it used to be approx 70000 Aussie's resettle in other countries each year. 
These numbers are old and from the last time I paid attention. 
Our debt was 600b and I used to get razzed up about that being too high. 
It's all too late, now we just ride the imaginary inflation and interest rate seesaw.