The three pie charts below show the changes in annual spending by a particular UK school in 1981, 1991 and 2001.

The pie charts displayed yearly

expenditure

by a certain school in the UK in 1981, 1991, and 2001.

Overall

, teachers’

salaries

were the highest area of expense throughout the years.

Furthermore

, the

proportion

of furniture and equipment overtook other workers'

salaries

as the second-largest

expenditure

in 2001.

Expenditure

on teacher

salaries

remained highest for all three years, accounting for 40%, 50%, and 45% of total spending respectively. The school spent the second largest

proportion

of its

expenditure

on other workers'

salaries

in both 1981 and 1991, and the figure continued to decline in 2001 by 15%.

Although

furniture and equipment dropped from 15% to 5%, it went up sharply and replaced other workers’

salaries

in 2001 as the second largest

expenditure

that year, at 23%. Spending on resources started at 15% in 1981. After experiencing a small growth in 1991, the number decreased to 9% in 2001.

Although

the

proportion

of insurance increased over the years, the number accounted for the smallest

proportion

of about 2%, 3%, and 8%, respectively.