The historical development of the world’s population By JavierArroyo 1 CE 1st century >>>> 256 million inhabitants 1200 1200 year >>>> 384 million inhabitants 1650 1650 year >>>> 516 million inhabitants 1750 1750 year >>>> 791 million inhabitants 1800 1800 year >>>> 890 million people 1900 1900 year >>>> 1.2 billion people 1918 1918 <----> 1920 flu epidemic 1950 1950 year >>>> 2.5 billion people 2000 2000 year >>>> 6 billion people 2015 2015 year >>>> 7.3 billion people 2025 2025 year >>>> 8 billion people