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

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The given pie charts illustrate a UK school's annual spending and show the changes over two decades. As is seen in the provided pie charts, the school spent an increasing percentage of money on teachers' salaries, with the maximum of 50% being spent in 1991, after which it was reduced by 5% in 2001.