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 charts illustrate how the shares of five different items comprising the yearly expenses of a British school changed between 1981 and 2001.

Overall

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, academic staff salaries contributed the largest share throughout the survey,

whereas

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insurance had the smallest.

While

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they rose

along with

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furniture and equipment, there were significant declines in the contributions of other workers’ salaries and resources. Wages paid to the teaching staff accounted for the most significant proportion of expenditure in 1981 (40%) and went up by a quarter in 1991 before declining slightly to 45% in 2001. In comparison, the salaries of non-academic employees were responsible for 28% of all expenses in 1981, but their share gradually dropped to 15% over the course of these 20 years. The share of furniture and equipment was

initially

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as high as that of educational resources (15%), but

while

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the former dropped by 2/3 before rising almost fivefold to 23%, the latter experienced a marked rise, after which it halved, reaching just below 10%. The contribution of insurance remained almost stable at 2-3% during the first 10 years, but it had increased almost threefold by 2001.