Changes in annual spending by a particular school from 1981 to 2001

The pie charts give information about annual school expenditure in a school in three separate years. In general, the percentage of spending on insurance rose slightly, while expenses on other workers' salaries experienced a noticeable decrease. However,   teachers' incomes accounted for most of total school spending for the past three decades. Resources, which made up 15% of the total spending in 1981, accounted for a high of 20% in 1991, the figure which was then followed by 11% decrease in 2001. On the other hand, the percentage of other workers' salaries, fell to 15% in 2001, a decrease by 13% from what it was in 1981. The proportion of furniture and equipment, which equaled to 15% in the beginning fluctuated sharply, with the figure increasing to 23% in 2001, an increase by 18% from what it was in 1991. However, the smallest amount of the expenditure was on insurance in the last 30 years.