Trackers,

I have used the figures that assume Medium fertility rates an Medium immigration rates.

I am not so optimistic on the immigration front as you are at least with regard to "quality immigrants".

Lets assume English-speaking countries ie US, UK, Can, Aus, NZ and Ire will only take English speaking immigrants.

All things being equal most immigrants would have NZ as their 5th choice out of this bunch - meaning NZ will have difficulty attracting 1st class immigrants. I suspect that even many of the 3rd class ones that come here view NZ as a stepping stone to OZ.

In addition NZ has the lowest wages of the lot so NZers are also emmigrating to the other 5 countries as well as a few others.

NZ could always boost it's population by immigration by lowering it's standards.

This is always a possibility and not nearly as bad as it sounds - as measuring peoples "quality" by the number and type of qualifications they have is far from an exact science.