Why is your total world population significantly lower than the actual population?

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The total world population that Ethnologue reports is the sum of the total populations of L1 speakers of the living languages. Those population numbers come from a variety of sources and from significantly different points in time. In addition, the Ethnologue lacks population estimates for about 4% of the world's languages and also does not automatically extrapolate population estimates to the current year, but waits for reports from reliable sources. As a result our world population count varies considerably from current census estimates.

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