Overall, it is clear that there was highest population of China between 1950 and 2000, however in 2050, the ratio of China will decrease as compared to India. To begin with, in 1950, the percentage of china was maximum and little over a quarter of a world population, but it was a decrease from quarter and stood at 24% in 2000. After that, it is estimated that the population of china will decline in 2050 and it will lesa than 20%. Probing further, the percentage of India was inversely proportional to China in 1950 and it was only 15%. In India there was a decrease population by 2000 and which was approximately 19%. whereas, it is projected that the ratio will greatest in 2050. Apart from that, the ratio of Japan and the USA also decreased from 10% and 5% in 1950, but in 2000 the ratio of 7. 5% and 4% respectively. It is estimated that will remain same in the USA, while in japan, it will decline 3% by 2050. 
 Overall
, it is  
clear
 that there was  
highest
  population
 of China between 1950 and 2000,  
however
 in 2050, the  
ratio
 of China will decrease as compared to India. To  
begin
 with, in 1950, the percentage of china was maximum and  
little
 over a quarter of a world  
population
,  
but
 it was a decrease from quarter and stood at 24% in 2000. After that, it  
is estimated
 that the  
population
 of china will decline in 2050 and it will  
lesa
 than 20%. Probing  
further
, the percentage of India was  
inversely
 proportional to China in 1950 and it was  
only
 15%. In India there was a decrease  
population
 by 2000 and which was approximately 19%.  
whereas
, it  
is projected
 that the  
ratio
 will greatest in 2050. Apart from that, the  
ratio
 of Japan and the USA  
also
 decreased from 10% and 5% in 1950,  
but
 in 2000 the  
ratio
 of 7. 5% and 4%  
respectively
. It  
is estimated
 that will remain same in the USA, while in japan, it will decline 3% by 2050.