For that indicator, The World Bank provides data for Vietnam from 1960 to 2017. The average value for Vietnam during that period was 1.25 percent with a minumum of 1.09 percent in 1960 and a maximum of 1.32 percent in 1994.
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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.