sentences:  According to a state report, for the 2011-2012 school year budgets, 247 school districts adopted a resolution certifying that tax rates would not be increased above their index; 250 school districts adopted a preliminary budget.Of the 250 school districts that adopted a preliminary budget, 231 adopted real estate tax rates that exceeded their index.Tax rate increases in the other 19 school districts that adopted a preliminary budget did not exceed the school district's index.