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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A glance at the three given graphs reveals some differences among the expenditures per year of a British school in a period of three years: 1981, 1991, 2001. Overall, it can be seen that there are many trends that are obviously illustrated in those charts: upward, downward and both upward and downward.