The chart above depicts the changes in population (in millions), over a period of 10 decades—between 1950 and 2050, for three different countries: United States, Nigeria and Japan; this includes the historical variation along with the projected changes in the population.
In 1950, Nigeria had the lowest population amongst the three, roughly around half of Japan’s, while United States took the lead with the highest population. The increase in United States’ population has remained steady across the years and is expected to maintain that pace in the future. Meanwhile, there has not been a significant increase in Japan’s population; rather, it started to decline after 2000 and the same pattern is expected to continue in the upcoming years.
Meanwhile, Nigeria’s population has grown exponentially, surpassing Japan in 2000, and is expected to overtake United States approximately between the years 2030-2033, becoming the most populous out of the three, expecting to reach 600 million by 2050.
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