Population - Components of population change by year ended June 1961–2023

Estimated de facto population: De facto population estimates include all people present in New Zealand and counted by the census (census night population count).
Estimated resident population: The estimated resident population is based on the census usually resident population count, updated for residents missed or counted more than once by the census (net census undercount); and births, deaths, and net migration between census night and the date of the estimate.
Natural increase: For the estimated de facto population, excess of registered births over registered deaths. For the estimated resident population, excess of estimated births over estimated deaths (both by date of occurrence).
Net migration: For the estimated de facto population, excess of total arrivals over total departures. Excludes armed forces before 1987.
For the estimated resident population, excess of permanent and long-term arrivals over permanent and long-term departures.

Estimates from 1991 onwards are not strictly comparable with estimates for earlier years, due to conceptual differences.

Population->Population Estimates - DPE->Estimated Resident Population Change by component (1991+) (Annual-Jun).
Population->Population Estimates - DPE->Estimated Resident Population by Age and Sex (1991+) (Annual-Jun). Choose "As at" and "Total all Ages" and all remaining variables.

Figure.nz synced the tables and added some calculations.

National population estimates give the best measure between census dates of the population that usually lives in an area, by age and sex, for the total New Zealand area.