What a poor effort! The US top 1% is going from strength to strength by whatever explanation or conspiracy theory is your poison. The NZ top 1% is failing completely on its job as the ruling class extracting the labour surplus without mercy or pity to immiserise the proletariat just because it thinks that is a viable long-term strategy for its class.
Source: The material wellbeing of NZ households: Overview and Key Findings from the 2017 Household Incomes Report and the companion report using non-income measures (the 2017 NIMs Report) prepared by Bryan Perry, Ministry of Social Development, Wellington, July 2017.
The income share of the New Zealand top 1% has been falling and falling for a long time now. The class struggle has been cancelled in New Zealand. What is a point of the class war if the ruling class is losing and the proletariat winning. Marxists have nothing to whine about.