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

The pie chart compares how much a school spends on five various categories in a year over three decades from 1981 to 2001

Overall

, it can be seen that the most significant percentage was spent on teachers' salaries

while

least

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on insurance over the three decades. In 1981, about two-fifths of the percentage went towards teacher's salaries which increased by 10% and declined by 5% in 1991 and 2001 respectively. Nearly one quarter was spent on other workers' salaries in 1982 and 1991

,

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and

subsequently

declined to 15% in the next 10 years.

On the other hand

, data for furniture and equipment fell dramatically by 2 folds from 15% to 5% in 1991

then

grew by 3 folds in the end. The same pattern was seen in books with 15%, 20% and 23% in 1981, 1991 and 2001 correspondingly.

However

,

the

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insurance received the lowest percentage which only ranged between 2% to 8%.