The pie charts provide data on the expenditure of a school in the UK in three different years.
It is clear that in 1981, teachers salaries represented the largest proportion of the school’s budget (40%). The figure increased to 50% in 1991, but declined by 5% in the last year. The percentage of spending in other workers salaries also decreased throughout the 20-year period, from just under 30% in 1981 to a mere 15% in 2001.
According to their figures, spending on insurance made up a small minority of the total. It stood at 2% in 1981 and reached 8% in 2001. By contrast, the percentages for resources and furniture fluctuated. The figure for resources was highest in 1991, at 20%, and the proportion of spending on furniture and equipment reached a peak in 2001 at less than a quarter(23%).
Overall, while teachers salaries accounted for the largest proportion of the schools spending, insurance remained the smallest cost in all three years. 
The pie charts provide data on the expenditure of a school in the UK in three  
different
 years.
It is  
clear
 that in 1981, teachers salaries represented the largest proportion of the school’s budget (40%). The figure increased to 50% in 1991,  
but
 declined by 5% in the last year. The percentage of  
spending
 in other workers salaries  
also
 decreased throughout the 20-year period, from  
just
 under 30% in 1981 to a mere 15% in 2001.
According to their figures,  
spending
 on insurance made up a  
small
 minority of the total. It stood at 2% in 1981 and reached 8% in 2001. By contrast, the percentages for resources and furniture fluctuated. The figure for resources was highest in 1991, at 20%, and the proportion of  
spending
 on furniture and equipment reached a peak in 2001 at less than a quarter(23%). 
Overall
, while teachers salaries accounted for the largest proportion of the schools  
spending
, insurance remained the smallest cost in all three years.