The given bar chart provides information on the proportion of the global population in four countries, namely India, China, the USA, and Japan in 1950 and 2002, and predictions for 2050.
Overall, it is evident that the figure for China, the USA, and Japan have a downward trend upon the given years. It is also worth pointing out that India was the only country which was predicted to have more population in 2050 than it had in 2002.
For a deeper look, in 1950, China had the highest figure of approximately 23%, followed by India, the USA, and Japan. After a sudden fall of 3%p in 2002, it is estimated to drop again until 2050 by 5%p, which is lower than that of India. The figure for India was 15% in 1950, which was almost 8%p lower than that of China. However it showed a marginal increase of 2%p in 2002, and is finally predicted to have more population than China in 2050.
The USA and Japan had far less proportions than India or China throughout the period. The USA had 6% of people in 1950, which was almost twice as large as that of Japan. In fact, the figures for Japan were almost half the size compared to that of the USA throughout the period. After the figure for the USA had a slight decrease of around 2%p in 2002, it is estimated to maintain the figure until 2050. In contrast, the percentage for Japan declined marginally by almost 0.5%p in 2002, and it is estimated to be halved in 2050.