The given diagram illustrates the percentage of the world’s population living in China, India, the USA and Japan in 1950 and 2002, with predictions for 2050.
Overall, China and India have the largest shares of the global population. China’s percentage is expected to fall, while India’s figure is predicted to rise and become the highest by 2050. In contrast, the USA remains fairly stable, whereas Japan shows a clear decrease and stays smallest one.
In 1950, China had the highest proportion of the world population, followed by India. Although China’s share decreased slightly in 2002, it is expected to drop more noticeably by 2050. By comparison, India demostates a steady increase throughout the period and is forecast to overtake China by 2050.
The USA accounted for a much smaller share of the world population than China and India. Its figure changed very little between 1950 and 2002 and is predicted to remain similar in 2050. Japan, however, follows a different trend. After a small rise in 2002, its population share is expected to decline significantly, making it the smallest among the four countries by 2050.