I do not trust the numbers for New Zealand prior to the early 1990s released by the OECD. New Zealand simply did not have a tax structure including a GST in the double digits back then to support estate of that size. Nonetheless, the size of government in New Zealand is systematically larger than in Australia, a richer country which can afford a large government and generous welfare state.
Source: General government – General government revenue – OECD Data and Data extracted on 12 Feb 2016 08:45 UTC (GMT) from OECD.Stat from OECD Economic Outlook November 2015.
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