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This chart shows the proportion of Maori ethnical background population for each territory in New Zealand. We can see that the north east side of the country has higher concentration of Maori folks.
The population data is downloaded from Statistics New Zealand (http://nzdotstat.stats.govt.nz/wbos/Index.aspx#). The boundary data is originally downloaded from Statistics New Zealand (http://www.stats.govt.nz/browse_for_stats/Maps_and_geography/Geographic-areas/digital-boundary-files.aspx) and converted to GeoJSON.