Data Sources

A description of the empirical data used and the methods applied in revising past estimates of population and components of demographic change (fertility, child, adult and overall mortality, international migration) is available here for each country or area for the period 1950-2020. For the countries with less than 90,000 inhabitants in 2019, only the data sources for total population are made available.

Select below a country or area to see the respective information, or download the whole set of metadata in PDF format for all countries or areas or a tabular version for each demographic component under Data download: Metadata.

Population: Total population and distribution by age and sex estimated to be consistent with the population by age and sex of the (a) 1954, 1961, 1966, 1971, 1976, 1981, 1986, 1991, 1996, 2001, 2006, 2011, 2016 censuses; (b) official estimates through 2017; and with estimates of the subsequent trends in fertility, mortality and international migration.

Fertility: Total fertility rate and age pattern of fertility based on: (a) official estimates of age-specific fertility rates through 2016; (b) registered births classified by age of mother and the underlying female population by age through 2016.

Child Mortality: Under-five mortality based on: (a) official estimates of infant and child mortality through 2015; (b) registered infant and child deaths through 2016.

Overall Mortality: Life expectancy at birth and age pattern of mortality based on: (a) official estimates through 2015; (b) registered deaths by age and sex available through 2015.

Migration: International migration based on: estimates derived as the differences between overall population growth and natural increase.

Disclaimer: This web site contains data tables, figures, maps, analyses and technical notes from the current revision of the World Population Prospects. These documents do not imply the expression of any opinion whatsoever on the part of the Secretariat of the United Nations concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.