Those stats come from nz stats.govt.nz
I posted this in another thread, and I think it is a very good comparison of equal sized cities in the US and NZ.
When we arrived (my wife and I, no kids) OH had a job that paid $75k. We weren't suffering but we had to budget and couldn't save more than a few hundred dollars a month. Our rent was $450, the place was a crap shack. If your in the hutt rent will be a little lower.