Band 7+: The three pie charts below show the changes in annual spending by local authorities in Someland in 1980, 1990 and 2000. Summarize the information and compare where relevant, by selecting and reporting the key features. You should write at least 150 words.

The given pie chart illustrates how the annual expense of local authorities in Someland varied from 1980 to 2000.

Overall, the expenditure on higher education was always the highest among all categories in every year. In addition, while the expense of K-12 education, transportation, and environmental services was on an upward trend, the opposite tendency was witnessed in the 3 remaining groups in the survey period.

Regarding the ascending groups, 35% of the annual spending of Someland authorities was on higher education in 1980, the figure then went up considerably and peaked at 45% in 1990 before declining to 40% in 2000. Meanwhile, in 1980, the percentage of yearly expenses for transportation was 16%, which is four times higher than that of environmental services. In the next 20 years, the figure for environmental services increased remarkably to 9%, that for transportation went down and hit a bottom at 6% in 1990, previously significantly bouncing back to 22% in the last year.

The proportion of annual spending on k-12 education and other service resources both decrease significantly from 25% and 6% to 22% and 1%, respectively. Whereas the figure for health and human resources was 14% in the first before peaking at 20% in 1990, then went down in half in the last year.