A look at how Pennsylvania public school spending is changing, overall and by district income levels, over the past four years. The figures are based on an Associated Press analysis of state Department of Education data on Pennsylvania's 500 school districts.

TOTAL SPENDING:By all districts: $25.1 billion (2010-11); $27 billion (2014-15)By top half of districts in income: $13.82 billion (2010-11); $15.26 billion (2014-15)By bottom half of districts in income: $11.28 billion (2010-11); $11.72 billion (2014-15)By top 20 percent of districts in income: $4.14 billion (2010-11); $4.55 billion (2014-15)By bottom 20 percent of districts in income: $2.03 billion (2010-11); $2.04 billion (2014-15)PER CHILDSPENDING:By all districts: $14,175 (2010-11); $15,603 (2014-15)By top half of districts in income: $14,514 (2010-11); $16,434 (2014-15)By bottom half of districts in income: $13,780 (2010-11); $14,640 (2014-15)By top 20 percent of districts in income: $15,900 (2010-11); $18,450 (2014-15)By bottom 20 percent of districts in income: $14,174 (2010-11); $14,425 (2014-15)Source: AP analysis of Department of Education data. (2010-11 figures are based on actual total expenditures and average daily membership; 2014-15 figures are based on budgeted expenditures in 2014-15 and average daily membership in 2012-13, the latest statistics available; income is based on 2012 tax data, the latest statistics available).