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Each map in this series shows the respective contribution of natural change and net migration to total change, for each territorial authority area across each five-year period (the data have been annualised). See for additional detail and methodological notes. The data are drawn from the NTOM Demographic Accounting Model originally developed as part of the MSI-funded NTOM (Nga Tangata Oho Mairangi) project [29661-HASTR-MAU] (2012-2014) and further supported by the Royal Society Marsden-funded Tai Timu Tangata. Taihoa e? project (2014-16) and the MBIE-funded CaDDANZ project (2015-21). The data have been converted for visualisation by the CaDDANZ Population Atlas research team.