http://www.immi.gov.au/media/statist...ts/migrant.htm
158k people immigrated to Australia last year, not including New Zealanders (Aus Total pop 21 million).
Having a skill is the key way of gaining entry (2/3s) the rest are family members.
Countries of birth for the 4.9 million at the bottom of this wiki entry: Demography of Australia
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As for the riots it was a public shame, and NSW was lampooned by other Australian states for it. Then again we have bigger riots with unemployed housing estate kids who are bored witless or post Christmas sales.
More seriously, yes there are very real frictions between some groups. The interesting thing is the maturity with which the seasoned adults helped cool the heels of the young troublemakers, dialogue opened up and long term solutions were found. Burqini
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Vast majority of Australians live in cities... I think about 90%. Population densities in cities are bout half that of most equivalent cities due to urban sprawl.
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