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. The shape of a Population Pyramid can help understand growth patterns and possible dependency issues or gender imbalances. A pyramid with a wide base and narrow top suggests high fertility and a growing population , whereas a pyramid with a narrow base suggests an ageing population with low fertility rates.
Compare pyramids over time from to based on United Nations Population projections. More on Population Pyramids. 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 Higher values indicate a greater level of dependency.
See also: definition and formula. A value below 2. See also: Countries in the world ranked by Life Expectancy. The population density in Sri Lanka is people per Km 2 people per mi 2 , calculated on a total land area of 62, Km2 24, sq. A Population pyramid also called "Age-Sex Pyramid" is a graphical representation of the age and sex of a population. There are three types of age dependency ratio: Youth, Elderly, and Total. All three ratios are commonly multiplied by Youth Dependency Ratio Definition: population ages divided by the population ages Elderly dependency ratio Definition: population ages plus divided by the population ages Total dependency ratio Definition: sum of the youth and old-age ratios.
Some portion of the population counted as "working age" may actually be unemployed or not in the labor force whereas some portion of the "dependent" population may be employed and not necessarily economically dependent. W Demographics Sri Lanka Demographics. Population Sex Ratio males vs. Sri Lanka Population. Yearly Change. Global Share. Global Rank. Potential Support Ratio. Both Sexes. Infant Mortality. Deaths under age 5. Expansive - pyramid with a wide base larger percentage of people in younger age groups, indicating high birth rates and high fertility rates and narrow top high death rate and lower life expectancies.
It suggests a growing population. Example: Nigera Population Pyramid Constrictive - pyramid with a narrow base lower percentage of younger people, indicating declining birth rates with each succeeding age group getting smaller than the previous one. Example: United States Stationary - with a somewhat equal proportion of the population in each age group.
