The three pie charts below show the changes in annual spending by a particular UK school in 1981, 1991 and 2001. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The provided pie charts illustrate the percentages of the annual expenses

in

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of

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a school in the United Kingdom in three years (1981, 1991, 2001).

Overall

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, in each year, teachers' salaries

was

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were

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reported as the highest spending,

while

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the lowest for insurance purposes. In 1981, teachers' wages accounted for 40% and increased in the next decade and reached

to

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apply

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50%.

However

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, the percentage allocated for

teachers

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teachers'

teacher's

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salaries was reduced back to 45% in 2001.

Similarly

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, expenses for books and resources started at 15% in 1981 and inclined to 20% in 1991 before experiencing a significant drop to 9% in 2001.

Besides

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, the percentage of insurance expenses increased from 2% to 8% between 1981 and 2001.

On the other hand

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, the percentage of spending on

salaries

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the salaries

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of other employees in the school was reduced throughout the period. It began at 28% in 1981 and reduced to 22% and 15% in 1991 and 2001 respectively.

However

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, the expenditures on

furnitures

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furniture

and other

equipments

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equipment

types of equipment

pieces of equipment

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accounted for 15%

in

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at

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the beginning of the period and dramatically dropped to 5% in 1991, and

then

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rocketed to 23%

in

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at

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the end of the period.