Buy: Merry Ottermas ugly Christmas t-shirt. Population growth by the level of development. The chart shows data for the period 1955-2015, plus projections for 2015-2100 using the UN Population Division data. The world has now surpassed this peak rate of growth, and the period between each billion is expected to continue to rise.
The period of fastest growth occurred through 1975 to 2011, taking only 12 years to increase by one billion for the 5th, 6th and 7th. The visualisation below provides an additional perspective on population growth: the number of years it took to add one billion to the global population. Time it took for the world population to double 7.