However, these populations often overlap, which influences population growth rate. "There is considerable overlap of these ethnic populations," population statistics manager Vina Cullum said. "People can and do identify with multiple ethnicities, especially people aged under 30 years."
In about one-quarter of births where a child was identified as Maori, the mother was non-Maori and the father was Maori. A similar rate was found in the Pacific population, where in one-quarter of births where a child was identified as Pacific, the mother was non-Pacific and the father was Pacific.
Another important factor was the much younger age structure of the Maori, Asian and Pacific populations and relatively high proportions of people at childbearing ages.
This provided greater momentum for future population growth. In contrast, 'European or Other' has a lower projected population growth rate due to a combination of lower fertility rates and an older age structure. This results in fewer births and more deaths.Growth in the Asian population would largely be driven by increased net migration.
Statistics New Zealand projected a net inflow of about 360,000 migrants over the 25-year period. Natural increase through births would account for about 250,000 or two-fifths of the projected Asian population growth. These projections reflect a combination of different patterns of fertility, migration, age structure, and ethnic identification. They are released by Statistics New Zealand every two to three years to maintain relevance and usefulness. They are not predictions, rather an indication of overall trends.
"Ethnic projections are of more than just academic interest," Vina Cullum said.
"They inform New Zealanders about our changing demographic picture. They help ethnic communities understand their own changing populations. And they assist planning in areas such as education and health where different ethnic populations can have different needs."