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

The given pie charts

compares

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the proportions of expenditure by a specific school in the UK in the years 1981, 1991,and 2001.

Overall

,we can see from the graphs that the majority of

resources

were invested in teachers' salaries.

On the contrary

,the cost of insurance was the minimum and other

resources

such

as books and hardware varied from different periods. Looking at the information in more detail,spending on teachers which accounted for the most proportion rose up to 50% but

finally

fell to 45% .Next came paying for other workers which

initially

constituted the second largest amount ,at 28%

while

gradually fell down 23%.the expense of coverage still remained the lowest during the span of 20 years. There was apparently reverse development between

resources

for books and hardware equipment

such

as furniture.They started with the same percentage ,

then

the former was four times as much as the latter ,

however

the putout of furniture and other facilities overweight that of books and other

resources

by two times in the end