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Compare pyramids over time from to based on United Nations Population projections. Higher values indicate a greater level of dependency. More on Population Pyramids. A Population pyramid also called "Age-Sex Pyramid" is a graphical representation of the age and sex of a population. The age dependency ratio expresses the relationship between the "dependent population" ages and plus, referred as "youth" and "elderly" and the "working age population" ages Total dependency ratio Definition: sum of the youth and old-age ratios. A Population Pyramid is a pair of histograms indicating the distribution of the population among the different age groups and sexes males on the left and females on the right.

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