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The three pie charts show the changes in annual spending by a particular UK school in 1981, 1991 and 2001.

As one can see from the charts teachers' salaries were the greatest item of expenses in all three time periods.

In 1991 this item took 50% of the school's budget which was an increase compared to 1981 (40%).

However, in 2001 it lowered to 45%.

The ratio of other expenses varied significantly.

In 1981 the second greatest fraction of annual expenses consisted of other workers' salaries (28%), which decreased through 22% in 1991 to 15% in 2001 moving to the third position in the list of total expenditures.

The amount of money spent on resources (e.g. books) equaled to the spending on furniture and equipment in 1981 (both were 15%).

In 1991 resources required more money (20%), while furniture and equipment – less (5%).

The situation changed to quite the opposite in 2001, when 23% of budget was spent on furniture and only 9% on resources.

Insurance was on the lowest position of the expenses list in the reviewed years, but showed a tendency for growth, having increased from 2% in 1981 to 8% in 2001.