Country rankings using data from official sources

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Percent of world population: The average for 2015 was 0.51 percent. The highest value was in China: 18.75 percent and the lowest value was in San Marino: 0 percent. Below is a chart for all countries where data are available for: Percent of world population.
Percent of world population, 2015
(percent, Source: The World Bank)
Definition: The population share of a particular country is measured as its population as percent of the total world population in a given year. Total population is based on the de facto definition of population, which counts all residents regardless of legal status or citizenship--except for refugees not permanently settled in the country of asylum, who are generally considered part of the population of their country of origin. The values shown are midyear estimates.