According to United Nations estimates, in 1911 there were a total of 1,760,000,000 inhabitants in the world, and its double (3,520,000,000 inhabitants) was reached in 1968. This number doubled again in 2012, when the world population surpassed the 7,040,000,000 inhabitants.
Thus, it went from a doubling in 57 years to a doubling in 42 years, which implies a decrease of 25% in the population doubling time.
Particularly, the period between 1911 and 1938 had a limited population growth rate, as the world population only grow by 600 million people during this period. This was mainly due to the First World War and certain famines and epidemics that were occurring during these decades, such as the Spanish Flu.
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