Via Paul Krugman, I hear that there is a World Top Incomes Database, which collects data on inequality. The dataset for NZ is complete from 1962 - 2002, and has some data up to 2005. Which means we can see who has really benefited from NeoLiberal "reform":
Its not as extreme a case as the US, but its a similar picture: NeoLiberalism stole money from ordinary kiwis and gave it to the richest of the rich. And now they're back in power and wanting to steal more.