The pie charts demonstrate the percentage of people which works in two sectors in town A and B in 1960 and 2010 years.
Overall, there are percentage of people in three sections; Manufactoring, sales, services. In town A percentage of services look like fewer than the percentage in town B. But in town A there was some privileges like percentage of people who works sevice section became more year by year.
In town B decreased persentage of sales almost for 17percent in 50 years, but the persentage of manufactoring were increased by 15 percent at the same time differences between sales in 1960 and 2010 I can’t say that they really differ but ur raise for 2 percent.
Considering the persentage of sections i would say menufactoring was increased rapidly by 35% and developed more than other section. In pie chart if one section increased it means that other sections decreased dramatic and this time is not exception. So the percentage of sales and sevices were decreased by 50% out of their 100%.