For that indicator, The World Bank provides data for Oman from 1960 to 2017. The average value for Oman during that period was 0.03 percent with a minumum of 0.02 percent in 1960 and a maximum of 0.06 percent in 2014.
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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.