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Population at the peak of the Roman Empire. (200AD)
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The world population in the year 1850. (The Industrial Revolution.)
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The Population on October the 27th 1991. (My Date of Birth.)
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The World Population when Barack Obama became the President-Elect of the USA.
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World Population in 2008. (I.E Now.)
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The World Population at the time when The Bubonic Plague was rife.