The two pie charts given depict some radical changes in the proportions of workers in three sectors in town A and town B over 50 years starting in 1960.
Overall, while the distribution of the workforce in town B consistently focused on manufacturing, that in town A shifted from manufacturing to services-related jobs.
First, the year 1960 witnessed a dominance of the manufacturing sector in town B , occupying 70%, while this figure in town A accounted for 41%. Additionally, the sector that came second in both towns was sales, making up 20% and 30%, respectively. Finally, service-related jobs in town B occupied half the percentage of sales, whereas that in town A was almost equal to sales.
In 2010, the proportions of the workforce in services in town A increased dramatically to 64%, nearly three times the figure in 1960. In contrast, in town A, the percentage of employees in manufacturing and sales sectors halved simultaneously. During the same period, in town B, there was a remarkable reduction in the workers in manufacturing by about 20%; however, this figure for sales almost remained static and that in services rose from 10% to 25%.