the bars below show the percentage of people working in different sectors in town A and town B in 1960 2010

The pie charts depict the distribution of employment of various industries namely manufacturing, sales and services in town A and town B from 1960 to 2010.

As can be seen, town A witnessed the greatest increase in the percentage of people joining in services, which overtook the remaining sectors to employ the majority of the town's workforce. However, in town B, manufacturing had the highest proportion of workers despite a light fall.

Both pie charts stood out with the dominance of manufacturing with the largest percentage of more than 40% in town A and 70% in town B in 1960. After 50 years period, those figures sharply fell by nearly one-fifth but town A had a sharper drop of half in total.Likewise, the employees having a sale-related job made up 30% and this figure also gradually decreased nearly a half of percentage. By contrast, the charts witnessed a reverse pattern in services, which was the lowest value at first in two towns, increased by more than 20% in the workforce to 64% and 25% respectively.

Such dramatic fluctuations were not seen when we compare the figures for sales workers, which stayed steady at about 20% despite a little decline.