Depends where you go.
People are like magnets; they stick to places where other people
are.
Cities tend to grow in population density, but suburban and
rural areas don't grow as fast. Some small cities/towns/villages
completely disappear, although its uncommon.
I think if you took away the densely populated areas of the USA
out of the statistics, it's likely that we wouldn't be so far
off from Australia.
But our cities are extremely popular and populated, which I
think skews the statistics somewhat.