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  256 milion inhabitants
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  384 milion inhabitants
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  Black death epidemic
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  There were 516 million inhabitants
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  Before the Industrial Revolution, 791 million
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  The Industrial Revolution is began
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  A great for change behind the growth and transformation of human society
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  There were 890 million people on Earth
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  This figure had reached 1.2 billion
 The population doubled within 100 years
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  There were 2.5 billion people in the world
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  Flu epidemic
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  6 billion people
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  The population exceeded 7.3 billion
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  Is predicted to be over 8 billion
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  There were 516 million inhabitants
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