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

The diagrams compare the expenditure of the school in 1981, 1991, and 2001.

Overall

, the components were divided into several parts which are

salaries

, resources, and

insurances

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insurance

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.

Firstly

, the

salaries

were the greatest proportion over 20 years, and

this

have

Unnecessary verb

apply

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included both teachers' and other workers'

salaries

. By 1991, the

amount

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number

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of

salaries

reached up to 72% which was more than half of all spending at that time.

Secondly

, the spending

of

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on

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the

Correct article usage

apply

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resources

were fluctuated

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fluctuated

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between 1981 and 2001.

According to

the charts, non-human resources held 30% of all

expenditure

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expenditures

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.

However

, in 1991, the cost of

resorces

Correct your spelling

resources

began to decrease to 25%, and it

had

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apply

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increased again after a decade.

Lastly

, insurance, the smallest part of the spending, had

Correct article usage

a slightly

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slightly

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slight

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increase

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increased

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every 10 years. It

was

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apply

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started at 2% and

increase

Wrong verb form

increased

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to 3% and 8% in 1981, 1991, and 2001 respectively. In summary, there were various differences

of

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in

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expenditure proportion between 1981 and 2001.

However

, the

salaries

were the largest cost to the school of all time.