The percentage increase in the population is highest as compared to that of the previous year in the year: Population 
1961
Calculation:
Apparently from the graph, we can interpret that the bar graph touched 10 and 30 for 1951 and 1961 respectively.
Here, the gap is 20.
For the rest of the chart, the gap is strictly 10 in an upward fashion.
Hence, in 1961 the population increase% is the highest.
∴ The percentage increase in the population is the highest as compared to that of the previous year in the year 1961.
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