The pie charts compare and contrast data on the change in the rate of people performing in different sectors in towns A and B in 1960, and 2010.
In general, the people working in manufacturing accounted for the highest in town B, while services and sales people were not occupied for a high proportion. At that time, the percentage of people working in the service sector in town A saw an upward trend during that period.
From 1960 to 2010, the services workers in town A experienced a significant twofold increase, from 29% to nearly 64%. In contrast, the sales and manufacturing workers saw a twofold decline, respectively, from 30% and 41% down to 16% and 20%.
In town B, starting in 1960, the proportion of manufacturing workers had a moderate downward trend, from 70% to 53%. During 1960 and 2010, the ratio of people who work in services increased moderately from 10% to 25%. At that time, the percentage of people working in sales grew slightly by 2%.