The three pie charts illustrate the distribution of annual expenditure by a specific UK school across five distinct categories over a 20-year period, specifically in 1981, 1991, and 2001. Overall, teachers' salaries consistently represented the largest proportion of the school's budget throughout the period, despite some fluctuation. A clear trend involved a significant decrease in other workers' salaries, while expenditure on insurance saw a steady, albeit small, rise. Spending on resources and furniture/equipment experienced notable shifts, showing less consistent patterns. In 1981, teachers' salaries constituted the largest share of the budget at 40%. This proportion then increased substantially to peak at 50% in 1991, before falling back slightly to 45% by 2001. In contrast, the budget allocated to other workers' salaries followed a continuous downward trajectory. Starting at 28% in 1981, it decreased to 22% a decade later and further dropped to just 15% by the end of the period, making it the second-smallest category in 2001. Expenditure on resources, such as books, also showed fluctuation. Initially, 15% of the budget was allocated to this category in 1981, which then saw an increase to 20% in 1991. However, this trend reversed sharply, with resources accounting for only 9% in 2001. Similarly, spending on furniture and equipment underwent dramatic changes. It began at 15% in 1981, plummeted to just 5% in 1991, but then experienced a considerable resurgence to 23% by 2001. Finally, insurance, while always the smallest spending item, saw a steady incremental increase, rising from 2% in 1981 to 3% in 1991, and then more significantly to 8% in 2001.
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