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The Demography of the World Population from 1950 to 2100. Data source: United Nations — World Population Prospects 2017. Demography (from Ancient Greek δῆμος (dêmos) 'people, society' and -γραφία (-graphía) 'writing, drawing, description') [1] is the statistical study of human populations: their size, composition (e.g., ethnic group, age), and how they change through the ...
Demographic statistics are measures of the characteristics of, or changes to, a population. Records of births, deaths, marriages, immigration and emigration and a regular census of population provide information that is key to making sound decisions about national policy. [1] [2] A useful summary of such data is the population pyramid. It ...
The population numbers below are computed by a combination of census reports, random surveys (in countries where religion data is not collected in census, for example United States or France), and self-reported attendance numbers, but results can vary widely depending on the way questions are phrased, the definitions of religion used and the ...
The MSA population as of July 1, 2023, as estimated by the United States Census Bureau [15] The MSA population as of April 1, 2020, as enumerated by the 2020 United States census [15] [a] The percent MSA population change from April 1, 2020, to July 1, 2023 [15] The combined statistical area (CSA) [16] if it is designated and the MSA is a ...
The Census Bureau showed a population increase of 0.98% for the twelve-month period ending in July 2024, [22] slightly below the world estimated annual growth rate of 1.03%. [23] The total fertility rate (TFR) in 2024 was around 1.84 children per woman, [5] which is below the replacement fertility rate of approximately 2.1.
Population geography involves demography in a geographical perspective. [ a ] It focuses on the characteristics of population distributions that change in a spatial context. This often involves factors such as where population is found and how the size and composition of these population is regulated by the demographic processes of fertility ...
Population growth is the increase in the number of people in a population or dispersed group. The global population has grown from 1 billion in 1800 to 8.2 billion in 2025. [3] Actual global human population growth amounts to around 70 million annually, or 0.85% per year.
In ecology, a population is a group of organisms of the same species which inhabit the same geographical area and are capable of interbreeding. [2] [3] The area of a sexual population is the area where interbreeding is possible between any opposite-sex pair within the area and more probable than cross-breeding with individuals from other areas.