The three pie charts below show the changes in annual spending by a particular UK school in 1981, 1991 and 2001. Summarize the information by selecting and reporting the main features, and make comparisons where relevant.

The three pie charts give the information about changes in annual spending in different criteria by a particular UK school in 1981, 1991 and 2001.

In all the 3 years, teacher's salaries was the most dominant criteria in total school spending with 40%, 45% and 50% in 1981, 1991 and 2001 respectively. The next dominant was other worker's salaries with 28% and 22% respectively in 1981 and 1991 respectively but in 2001 only 15% was spent on it. Least amount of money was spent in insurance in 1981 and 1991 with just 2% and 3% respectively, however, in 2001 importance of insurance was felt and about 8% of total money was spent on it. Although only 5% of total money was spent on furniture and equipment in 1991, 15% and 23% of total money was spent on it in 1981 and 2001 respectively. The expenditure in resources also varied in three different years with 15%, 20% and 9% in 1981, 1991 and 2001 respectively.