The bar graph shown above indicates the population of the four countries from the year 1950 to 2000 while also making the projections for the year 2050.
It is clear from the graph that China has the highest percentage of world population in 1950 and 2000, but estimates show that India will take the lead by 2050.
Seeing the graph of Japan, it can be said that it has lowest percentage of population i. e 5% in the year 1950 and will keep decreasing, till the predicted projections it would become nearly 3% which the lowest percentage among the 4 countries.
Whereas comparing India it can be seen that it has the steady increase in the percentage of population going from 15% to 19% till the year 2000, in the year 2050 it will reach upto 21% which would be the highest percentage of population among the countries that are compared.
In 1950, China accounted for a little over a quarter of the world’s population, although it decresed to a little under a quarter, it was still the highest in 2000, compared to three countries. It is estimated that the population of China will continue to drop and would reach approximately 19% by 2050.
When it comes to the population of USA, it showed the decrease from 1950 to 2000 but the percentages remain steady for the year 2000 to 2050. 
The bar graph shown above indicates the  
population
 of the four countries from the  
year
 1950 to 2000 while  
also
 making the projections for the  
year
 2050.
It is  
clear
 from the graph that China has the highest  
percentage
 of world  
population
 in 1950 and 2000,  
but
 estimates  
show
 that India will take the lead by 2050.
Seeing the graph of Japan, it can  
be said
 that it has  
lowest
  percentage
 of  
population
 i. e 5% in the  
year
 1950 and will  
keep
 decreasing, till the predicted projections it would become  
nearly
 3% which the lowest  
percentage
 among the 4 countries.
Whereas comparing India it can be  
seen
 that it has the steady increase in the  
percentage
 of  
population
 going from 15% to 19% till the  
year
 2000, in the  
year
 2050 it will reach  
upto
 21% which would be the highest  
percentage
 of  
population
 among the countries that  
are compared
.
In 1950, China accounted for a  
little
 over a quarter of the world’s  
population
, although it  
decresed
 to a  
little
 under a quarter, it was  
still
 the highest in 2000, compared to three countries. It  
is estimated
 that the  
population
 of China will continue to drop and would reach approximately 19% by 2050.
When it  
comes
 to the  
population
  of USA
, it  
showed
 the decrease from 1950 to 2000  
but
 the  
percentages
 remain steady for the  
year
 2000 to 2050.