|Adjustments||Not Seasonally Adjusted|
|Births||2019 Q1||14,940||14,217||#, NSA||Quarterly|
|Deaths||2019 Q1||7,677||8,169||#, NSA||Quarterly|
|Population||2019 Q1||4,957,400||4,929,700||#, NSA||Quarterly|
|Birth Rate||2016||12.65||13.27||# per Ths. pop.||Annual|
|Death Rate||2016||6.64||# per Ths. pop.||Annual|
Resident population estimates - The estimated resident population of New Zealand is an estimate of all people who usually live in New Zealand at a given date. This estimate is based on the census for resident population count. Which is updated for residents missed or counted more than once by the census (net census undercount), as well as residents temporarily overseas on census night, births, deaths, and net permanent and long-term migration between census night and the date of the estimate.
Estimated de facto population: the estimated de facto population of New Zealand includes all people present in New Zealand and counted by the census (census night population count). This estimate includes visitors from overseas who are counted on census night, but excludes New Zealand residents who are temporarily overseas.
Estimated resident population: an estimate of all people who usually live in New Zealand on a given date. Visitors from overseas are excluded.
International migration: migration into or out of New Zealand. International migration statistics are based on 'permanent and long-term' migration statistics, which are primarily determined by passengers' responses on arrival and departure cards about how long the person is in or away from New Zealand, and where they last lived or will live for the next 12 months or more.
Median age: half the population is younger, and half older, than this age.
Natural increase or decrease: natural increase is an excess of births over deaths. Natural decrease is an excess of deaths over births.
National population estimates are published quarterly and subnational population estimates are published annually.
The estimated resident population is produced using the component methodology and 'date of event' method. The estimates use census data (census usually resident population count) as a starting point. Consequently estimates of the resident population based on one census cover one intercensal period (and slightly beyond) until more recent census data becomes available. When the more recent census data becomes available, this is incorporated into the new base for the next 5-year period. National population estimates are produced quarterly.
To produce population estimates for the current quarter, previous estimates or the base population are updated using births, deaths and external migration data for the current quarter. Birth and death registrations are captured by the Department of Internal Affairs. Statistics New Zealand receives this vitals data each month.
Migration data is not estimated, as all required data is available from Statistics New Zealand's external migration databases.
The formula used for estimating the national resident population is:
Population (current quarter) = population (previous quarter) + births - deaths + net migration (difference between international permanent and long-term arrivals and departures).
Census usually resident population count: a count of all people who usually live in New Zealand and are present in New Zealand on a given census night. This count excludes visitors from overseas, and residents temporarily overseas on census night. The population counts published from the census are not comparable with the estimated resident population.
Provisional and final estimates are produced for the resident population each quarter.
When the more recent census data becomes available, this is incorporated into the new base for the next 5-year period. National population estimates are produced quarterly.
For further details, please read: http://datainfoplus.stats.govt.nz/item/nz.govt.stats/4c9f3523-5386-4ce0-a8bd-993bb905f119