I note that net NZers leaving NZ reached some kind of a peak in 2012 (while National were in office). It's just getting a lot messier overseas, is a big part of the reason they are now staying. But look at the non-NZ citizen figures, a very unusual situation in being that high. Over the Clark years, NZers soon started returning, later moderate numbers of NZers left, a growing trend, but then the same thing happened under National in the term before that. The outgoing number was higher in 2012, under National. Maybe it's National policies that some don't like..
http://www.stats.govt.nz/~/media/Sta...-pmt-86-16.gif