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

The three pie charts give data on how much money was spent in a special UK school per year from 1981 to 2001. Measurement is in percentage. Overall, teachers’ salaries constituted the highest proportion, while the lowest amount was observed in insurance over a 20 years period. In detail, teachers’ salaries were equal to 40% and 50 % respectively between 1981 and 1991, then this indicator decreased to 45% in 2001. Other workers’ salaries showed a downward trend. At the beginning this ratio made up 28%, for the next 20 years this amount reduced remarkably, standing at 15%. Resourses e. g books and furniture and equipment maintained the same level, accounting for 15% in 1981. However, this figure for resourses e. g books went up to 20%, while the percentage of furniture and equipment decreased 3 times and became 5% for the next 10 years. In 2001 the quantity of resources e. g books halved, whereas this percentage for furniture and equipment surged to 23% in 2001. This segment for insurance reached the lowest peak of 2% and 3 % accordingly from 1981 to 1991, then increased to 8% in 2001.