The chart below illustrates the percentage of the total world population of four distinctive countries in 1950, 2002 separately and anticipates this tendency in 2050.
Overall, only India shows a rising tendency of population, while the other countries show a decreasing tendency from 1950 to 2050.
In 1950, the population rate of China was significant compared to the other three countries. It was nearly 19 percent points higher than that of Japan, and it showed a noticeable gap with India also but it changed little by little from 2002. Although the difference was almost the same between China and the USA in 2002 compared to 1950, the gap became conspicuously dropped between China and India in the same period.
The flow finally will be reversed in 2050 by showing a noticeable change between the population percentage of India and China. In 2002, India’s population rate was about 5 percent points lower than that of China. This circumstance will be the opposite in 2050 that India’s population ratio indicates 8 percent points higher than that of China.