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1 CE
1st century >>>> 256 million inhabitants
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1200
1200 year >>>> 384 million inhabitants
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1650 year >>>> 516 million inhabitants
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1750 year >>>> 791 million inhabitants
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1800 year >>>> 890 million people
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1900 year >>>> 1.2 billion people
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1918 <----> 1920 flu epidemic
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1950 year >>>> 2.5 billion people
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2000 year >>>> 6 billion people
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2015 year >>>> 7.3 billion people
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2025 year >>>> 8 billion people