Time for the world population to double, 1495 to 2078

The number of years taken for the world population to double across different stages of history. Labels show the change in the population level: for example, the yearstaken to go from 0.25 to 0.5 billion; then 0.5 to 1 billion.

Year that population level was passed149516001700180019002000Numberofyearstodoublepopulationsize0.25B to 0.5B0.25B to 0.5B0.5B to 1B0.5B to 1B1B to 2B1B to 2B1.5B to 3B1.5B to 3B4B to 8B4B to 8B