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.

Venezuela (Bolivarian Republic of)
Population: Total population and distribution by age and sex estimated to be consistent with the population by age and sex of the (a) 1950, 1961, 1971, 1981, 1990, 2001, 2011 censuses; (b) official estimates through 2018; 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) registered births classified by age of mother and the underlying female population by age through 2017; (b) adjusted for underregistration; (c) birth-histories data from the 1977 WFS and 1993 ENSO and 1998 ENPOFAM and 2008, 2010 ENDEVE; (d) births in the household in the preceding 12 (or 24) months classified by age of mother from the 1950, 1961, 1971, 1981, 1990, 2001, 2011 censuses; (e) adjusted fertility using Brass P/F ratio method (or variants) with data on children ever born and births in the preceding 12 (or 24/36) months, both classified by age of mother, from the 1950, 1961, 1971, 1981, 1990, 2001, 2011 censuses; (f) indirect estimates obtained from the application of the own-children method of fertility estimation to the 2001 Census; (g) International estimates considered up to 2017.  In addition, the official estimates of age-specific fertility rates through 2014 have been considered.

Child Mortality: Under-five mortality based on: (a) registered infant and child deaths through 2016; (b) adjusted for underregistration; (c) direct estimates from births and deaths under-five calculated from full birth histories data from the 1977 WFS and 1998 ENPOFAM; (d) indirect estimates from data on children ever born and surviving from the 1961, 1971, 1981, 1990, 2001, 2011 censuses; (e) International estimates considered up to 2018.

Overall Mortality: Life expectancy at birth and age pattern of mortality based on: (a) registered deaths by age and sex available through 2016; (b) adjusted for underregistration; (c) adjusted for underreporting of infant and child deaths; (d) adult deaths adjusted for underregistration using the growth balance method; (e) mortality rates were extrapolated using projection methods; (f) International estimates considered up to 2017; (g) estimates of under-five, adult and old age mortality.  In addition, the official estimates through 2007 have been considered.

Adult and Old Age Mortality: Estimates derived from: (a) deaths by age and sex available from Register through 2014; (b) adjusted for underregistration; (c) International estimates considered up to 2017.  In addition, the recent household deaths data by age and sex from the 1998 ENPOFAM have been considered.

Migration: International migration based on: (a) information on foreign-born populations from censuses and registers from major countries of destination (Latin American countries, Spain and United States of America); (b) estimates derived as the differences between overall population growth and natural increase; (c) UNHCR statistics on the number of refugees in the main countries of asylum.

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.