The pie charts illustrate data about the proportion of individuals who were working in different sectore in townships A and B, over a fifty-year period between 1960 and 2010.
Overall, in town A the manufacturing was the most popular in 1960,but in 2010 the services were well-known among people. Another interesting point is that a large number of the citizens in town B worked in manufacturing over the period.
According to the city A, many people worked in manufacturing, it accounted for 41%, while sales and services showed almost similar proportions at 30% and 29% respectively, in 1960. However, these percentages were changed in 2010, the manufacturing and sales declined significantly to 20% and 16% respectively. Meantime, the services accounted for 64%, which means that the this sectore was popular among workers.
As for city B, citizens in this city mostly worked in manufacturing which accounted for 70%, in 1960. Meanwhile, the percentages in sales and services was 20% and 10% in turn. In 2010, there was a considerable decrease to 53% in manufacturing, but this sectore still stayed as famous among others. The sales and services increased to 22% and 25% in turn.