The percentage of the New Zealand population born overseas declined over time, and natural increase became the driver of population growth. Birth overseas reached its lowest point in the mid-20th century and increased slowly from the 1960s. The gender gap narrowed significantly from the 1930s, and closed entirely in the late 20th century.
Te whakamahi i tēnei tūemi
Te Ara – The Encyclopedia of New Zealand

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Source: Statistics New Zealand
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