The three pie charts compare the changes in the shares of six different items which comprised the yearly expenses of Springfield College between 1990 and 2010.
Overall, while the shares of three items experienced rises, there were declines in the remaining three. Moreover, teacher salaries contributed the largest proportion of expenditure throughout the survey, whereas insurance had the smallest share.
Wages paid to the teaching staff accounted for the most significant proportion of expenditure in 1990 (40%) and went up to a half before declining slightly. In comparison, the salaries of non-academic employees were less than a third of all expenses at the beginning of the period, but their share dipped by 13% over the of these 20 years.
The share of furniture and equipment was initially as high as that of books (15%), but while the former reduced five times, falling 3% by the end, the latter experienced marked rise after which it halved, reaching just below 10 percent.
The contribution of insurance and technology had risen minimally from average 1.5% until 3% by 2000, before increasing 8% and 20% during the next 10 years, respectively.