Act 1 included 10 exceptions, including: increasing pension costs, increases in special education costs, a catastrophe like a fire or flood, increase in health insurance costs for contracts in effect in 2006 or dwindling tax bases. The base index is the average of the percentage increase in the statewide average weekly wage, as determined by the PA Department of Labor and Industry, for the preceding calendar year and the percentage increase in the Employment Cost Index for Elementary and Secondary Schools, as determined by the Bureau of Labor Statistics in the U.S. Department of Labor, for the previous 12-month period ending June 30. For a school district with a market value/personal income aid ratio (MV/PI AR) greater than 0.4000, its index equals the base index multiplied by the sum of .75 and its MV/PI AR for the current year. In June 2011, the Pennsylvania General Assembly eliminated six of the ten the exceptions to the Act 1 Index. The following exceptions were maintained: 1) costs to pay interest and principal on indebtedness incurred prior to September 4, 2004 for Act 72 schools and prior to June 27, 2006 for non-Act 72 schools; 2) costs to pay interest and principal on electoral debt; 3) costs incurred in providing special education programs and services (beyond what is already paid by the State); and 4) costs due to increases of more than the Index in the school's share of payments to PSERS (PA school employees pension fund) taking into account the state mandated PSERS contribution rate. The School District Adjusted Index for the Pleasant Valley School District 2006-2007 through 2011-2012. For the 2014-15 budget year, Pleasant Valley School Board applied for two exceptions to exceed their Act 1 Index limit: special education costs and escalating teacher pension costs, which rose over $888,489 in 2014. In 2014-15, all Pennsylvania school districts were required to make a 21.4% of payroll payment to the teacher's pension fund (PSERS). For the school budget 2014-15, 316 Pennsylvania public school districts adopted a resolution certifying that tax rates would not be increased above its Act 1 Index limit. Another 181 school districts adopted a preliminary budget leaving open the option of exceeding the Index limit. Districts may apply for multiple exceptions each year. For the pension costs exception, 163 school districts received approval to exceed the Index in full, while others received a partial approval of their request. For special education costs, 104 districts received approval to exceed their tax limit. Seven Pennsylvania public school districts received an approval for the grandfathered construction debts exception.