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 given pie chart is a figure revealing data about the change in yearly spending by a specific UK school in 1981, 1991, and 2001.

Overall

,

it is clear that

this

school spent the largest proportion of its budget on teachers' salaries, which has fluctuated in these years.

Moreover

, the smallest proportion of spending was on insurance. As the graph shows, teachers' salaries in 1981 were the lowest at 40%. In 1991, 5% was added to reach 50%,

while

in 2001, 5% was reduced again to reach 45%. Meanwhile, in 1981, the lowest

percent

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per cent

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was contributed to insurance at 2%, and every year it was added until it reached 8% in 2001.

Additionally

, in 1981 and 1991, the percentage of spending on other workers' salaries was in the second segment at 28% and 22%, respectively.

However

, from 1981 on, it started to reduce, and in 2001, it was just 15%.

Furthermore

, in 1981, the amount of spending on resources (

such

as books) and furniture and equipment

was

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were

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relatively similar at 15%,

while

in 1991, the budget, which belonged to resources, was increased to 20%, and the furniture and equipment stage had a significant diminishment at just 5%.

In contrast

, in 2001, the resource fraction was lower than furniture and equipment. These figures were just 9% and 23%, respectively