BarTender:mattwnz: But wasn't voter turnout this year at 75% which is quite high, especially as the weather was terrible. This sounds a lot higher than in previous elections. I beleive the US voter turnout is int he 50-60% range.
See the previous page showing total population vs turnout was around 66% or so. So 91% were enrolled based on the 2013 census and of the 91% only 75% voted. http://www.elections.org.nz/research-statistics/enrolment-statistics-electorate
It's been on a downward direction for a while: http://www.idea.int/vt/countryview.cfm?CountryCode=NZ
Total population though is irrelevant, as you have to meet certain criteria to be a voter. eg you can't be in prison and you have to be over 18 etc.