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

The pie charts represent the UK school spending of various factors from 1981 to 2001. Overall, it is noticeable that majority of school's expenditure is teachers' salaries. However, insurance indicates the least amount of money that school spent. Focusing on the 1981 to 1991, about three quarters of the school expenses go to teachers and other worker income, which is 40% and 28% respectively. Moreover, furnitures and equipments have the same proportion of consumption as books (15%). However, teachers' salaries took over half of the school's spending and the school decrease spending on workers(22%) and appliances(5%) over 10 years period. Turning to 1991 to 2001, the data reveals that the academy have decrease 5% of the teachers' income and 7% of employees money. Furthermore, school has highly interested in expanding furnishing equipment to 23%, but reduce budget of resources to under 10%. On the contrary, school has gradually increasing in insurance rate in the year 1981, 1991, and 2001 from 2%, 3%, and 8% respectively.