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

The pie charts compare the amount of money allocated to various expenditures of a particular school in the UK in 1981,1991, and 2001.

Overall

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, the highest amount of money was spent on teacher's salaries in all years,

while

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insurance had the smallest portion.

It is clear that

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the vast majority of total money was spent on teachers' salaries,

accuonted

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accounted

for 40% in 1981, and increased to half of the expenses in 1991,

then

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in 2001 it surprisingly experienced a slight decrease of 5%.

By contrast

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, other worker's salaries showed a fall trend from 28% in 1981 to 15% in 2001. In 1981, resources and furniture had a similar share of 15%,

then

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the former decreased to 5% and the latter increased to reach 20% in 1991. In 2001, the amount recorded was 9% and 23% respectively. The share of insurance was approximately the same in 1981 and 1991, following which experienced a

raise

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rise

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of 5%.