The provided pie charts illustrate data about annual expenditure in Springfield college in 1990, 2000 and 2010.
Overall, teacher’s salaries made up the largest shares in three years. Technology’s proportion was the smallest at the beginning of the period, but expanded the share to the second largest proportion by the ending of the period, while share of furniture and eqipment became one of the smallest proportions.
The portion of teachers salaries experienced slight increase and remain the largest fraction in all three years, while the technology’s spending increased dramatically from 2% to 30%, becoming the second largest proportion. Also the insurance’s share rose by 7%.
Turning to the other employee’s salaries, this spending had decreased gradually from 28% to 15%. The books expanditure firstly increased, later decreased by 2010. In contrast, the share of furniture and eqipment decreased significantly by 14%, and had become one of the smallest share in 2010.
