The given pie charts compare statistics for the yearly expenses of 5 different categories by a specific school in the United Kingdom between 1981 and 2001

The three pie charts illustrate annual school costs distribution in 1981, 1991, and 2001, spanning a

tw

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two

-decade period,

Overall

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,

teachers

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teachers'

teacher's

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salaries

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remained to be the largest share across two decades,

while

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the

salaries

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for other workers shrunk significantly. The expenses in resources and

equipments

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equipment

types of equipment

pieces of equipment

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had undergone drastic fluctuations. Casting back to 1981, the

salaries

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for teachers and other workers attracted 40% and 28% of the total school spending respectively, accounting for approximately 70% combined. Even amount is spent on resources like books and furniture and

equipments

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equipment

types of equipment

pieces of equipment

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, constituting for 15% each.

Consequently

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, the expenses on insurance held a negligible proportion of 2%. Looking closer at the 1991's pie chart, the money spent on teachers'

salaries

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had increased to reach half of the total spending,

while

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the expenses on furniture and

equipments

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equipment

types of equipment

pieces of equipment

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had experienced a sharp drop to 5%. Dramatically, the counterpart in 2001 increased to 23%, indicating

a

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an

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18% net growth, which is larger than the shares of resources and insurance combined. It's

also

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noteworthy that the investment in insurance had exhibited substantial growth during the whole period, reaching a peak of 8% in 2001.