The supplied line graph demonstrates the information about the changes in the ratio of senior citizens in three different areas of the globe within a time span of a century from 1940 to 2040.
On the whole, it is significant to note that the population of the elderly in three countries increased variously while it is estimated that the senior citizen's population of Japan will overtake than that of the USA at the end of the given time period. In 1940, the index of the USA was a highest at around 9 percent whereas the figure of Japan indicated the lowest proportion with exact 5 percent. At the same time, Sweden illustrated approximately 7%. With regards to the figure of the USA, the percentage rose noticeably to 15% till the year 1980.
Turning to the figure of Sweden, the percentage improved with several fluctuations till the year 2020, then is predicted to rocket to exactly 25 percentage till the end of the period. After declining moderately to around 3% in the first 4 decades the proportion elderly in Japan will have increased gradually to one tenth till 2030. It is estimated that the ratio will skyrocket to just 30 percent till the 2040. 
The supplied line graph demonstrates the information about the  
changes
 in the ratio of senior citizens in three  
different
 areas of the globe within a time span of a century from 1940 to 2040. 
On the whole
, it is significant to note that the population of the elderly in three countries increased  
variously
 while it  
is estimated
 that the senior citizen's population of Japan will overtake than that of the USA at the  
end
 of the  
given
 time period. In 1940, the index of the USA was  
a
 highest at around 9 percent whereas the figure of Japan indicated the lowest proportion with exact 5 percent. At the same time, Sweden illustrated approximately 7%.  
With regards to
 the figure of the USA, the percentage rose  
noticeably
 to 15% till the year 1980.
Turning to the figure of Sweden, the percentage  
improved
 with several fluctuations till the year 2020, then  
is predicted
 to rocket to exactly 25 percentage till the  
end
 of the period.  
After
 declining  
moderately
 to around 3% in the  
first
 4 decades the proportion elderly in Japan will have increased  
gradually
 to one tenth till 2030. It  
is estimated
 that the ratio will skyrocket to  
just
 30 percent till the 2040.