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

The pie charts

illustrates

Correct subject-verb agreement

illustrate

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a breakdown of annual spending by a particular UK school over a period of 20years from 1981 to 2001.

Overall

Linking Words

, teachers'

salaries

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accounted for the largest share of school spending throughout most of the period,

while

Linking Words

the lowest spending was observed in insurance. Meanwhile, there was a steady drop in spending

of

Change preposition

on

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other workers'

salaries

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over the decades. The percentage of teachers'

salaries

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rose gradually from 40% to 50% between 1981

to

Correct word choice

and

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1991, reporting the highest figure, and declined to the 45% in the end of

2001

Punctuation problem

2001,

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while

Linking Words

it was still the most substantial spending.

By comparison

Linking Words

, the insurance was the lowest at less than 10% during these years.

However

Linking Words

, it experienced a steady increase throughout the period. The spending of resources

such

Linking Words

as books reached a peak of 20% before declining steadily.

By contrast

Linking Words

, the cost of furniture and equipment showed an opposite fluctuation

which

Punctuation problem

, which

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was

same

Correct article usage

the same

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to

Change preposition

as

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the teachers'

salaries

Use synonyms

.