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.

Three pie charts illustrating the variations in annual spending by a particular UK school in 1981,1991 and 2001. Overall, it can be seen that throughout the 20years that is,the period of (1981-2001) the school spent more money on teachers salary while small amount of money was spent on insurance.

To start with,teachers salary constitute the greatest percentage of the school spending. It can be seen that in the year 1981, 40% was spent on teachers' salary and this slightly increase by 10% in the year 1991 but in the year 2001,it is seen to drop from 50% - 45%. Also other workers such as the non-teaching consume a greater portion of the school income but it is seen to decrease all through the years,it ranges from 28% to 22% then 15% for the year 2001.

However,the school is seen to spend a minor amount on insurance,they started with 2% in the year 1981,it then increased by 1% in the year 1991 but in year 2001 5% was used to insure the school properties. In addition,a reasonable amount of money was spent on other materials such as resources,furniture and equipments.