The three pie charts compare the expenditure of a school in uk over a 20-year period

The three pie charts compare the expenditure of a school in UK over a 20-year period.
Overall, it is clear that the expenditure of teachers’ salaries were the greatest rate in three years compared to spending insurance, other worker’s salaries, resources, furniture and equipment, whereas spending insurance was the smallest cost in each year.
In 1981, we can see that teachers’ salaries made up the biggest proportion rate of the school spending and this figure was 40%, but the rate rose to 10% in 1991. The expenditure of resources, furniture and equipment constituted the same percent, with 15% and spending resources experienced an increase over a period of 10 years that the rate reach to 15%, while furniture and equipment declined to 10%, with 5%. On the other hand, other teachers salaries saw a decrease from 1981 to 2001, with by 13% and this rate was 15% in 2001.
In 2001, teacher’s salaries and recourses decreased to 5% and 11% school spending and these rates accounted 45% and 9%.
Surprisingly, the expenditure of furniture and equipment saw a increase in that year and this figure reach a peak, with 23%.