The bar graph illustrates the total percentage of the population in India, China, the USA, and Japan for the years 1950 and 2002, as well as projections for 2050.
Overall, China held the highest population ratio in the world in the past, while India is projected to have the highest population ratio in 2050. In contrast, Japan has consistently had the lowest percentage.
Focusing on the countries with a significant increase, India is the only nation showing a rising trend with a stable growth rate of approximately 1% to 2% per year from 1950 to 2050, beginning at around 15%.
On the other hand, regarding countries with a declining population, China has experienced a notable decrease, dropping from the highest percentage to second place by 2050, declining from around 23% to 15%. The USA, meanwhile, saw only a slight decline of about 2% to 3% between 1950 and 2002, starting at roughly 8%, and is expected to maintain a stable population until 2050.
Finally, Japan has had the lowest percentage both in the past and projected for the future, with a decrease from under 5% to approximately 1% or 2%.
