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 three pie charts compare the proportion of expenditure where it went in 1981, 1991 and 2001,

according to

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five sources( insurance, teachers'

salaries

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, furniture and equipment, other workers'

salaries

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and other resources).

Overall

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, in all three years, a significant percentage of money was spent on teachers'

salaries

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,

while

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insurance remained the smallest within the five categories. To be specific, in 1981, expenditure on

salaries

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( teachers and other workers) was the main spending, with 40% and 28%, respectively.

However

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, both witnessed an incremental change in two decades, the former fluctuated between 40% and 50%, and the latter decreased gradually from 28% to 15%.

On the other hand

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, of all sources of spending, furniture equipment and resources accounted for the same volume of 15%

initially

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.

Although

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there was a significant drop in furniture and equipment in 1991, from 15% to 5%, it recovered notably to 23% in 2001. In terms of insurance, in comparison with other expenditures, the school spent the least money on it during the given years, with 2%, 3%, and 8%, respectively.