The pie charts compare two towns A and B in terms of people working in three main fields namely : manufacturing, sales and services from 1960 to 2010. Overall, manufacturing was the main category of town B in both years. It is also clear that the rate of employees in town A was evenly distributed among all sectors in 1960 before focusing on services in 2000.
Looking at town A, manufacturing recorded the highest working rate (41%) in 1960, followed by sales and services, at 30% and 29% respectively. However, services workers significantly increased almost by twice from 29% to 64%, which made it overtake manufacturing and become the biggest category in 2010. Notably, both sales and manufacturing nearly halved from 41% and 30% to 20% and 16% respectively.
Regarding town B, manufacturing employees in 1960 accounted for 70% in total, which was more than double the figure for total sales and services. Even though there was a slight drop in the proportion of people working in manufacturing in 2010, from 70% to 53%, this field still had the highest working rate in all sectors. In contrast, both sales and services witnessed a negligible rise in the percentage of workers with the former growing from 20% to 22% and the latter climbing from 10% to 25% in 2010.