The 3 pie charts below show the changes in annual spending by a particular UK school in 1981, 1991, and 2001.

The charts exhibit the alterations of a certain UK academy in their yearly expenditures for the years 1981, 1991, and 2001. The highest portion of the money spent in all 3 years goes to the teachers' salaries.

On the other hand

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,

although

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having the lowest total expenditure, a substantial increase can be seen in spending on insurance. In detail, there is a fluctuation seen towards the expenditure on teacher's salaries from 40% in 1981, rising to half the total spending

on

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in

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1991,

then

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lastly

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reduced by 5%

on

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in

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2001. In 1981, 30% of the total portion of overhead is spent on resources,

and

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apply

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furniture and equipment,

subsequently

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reduced by 5% in 1991. By 2001, the total percentage of school spending on the latter exceeded 2% of that of 1981.

Furthermore

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, a stable rise in the portion that goes to insurance can be seen,

although

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it remains to have the lowest percentage among all of the school expenditures. Meanwhile, the proportion of expenditure on other workers' salaries declined over the years, from 28% in 1981

then

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dropping to more than half in 2001.