On May 16, the European Commission announced that the European Union Emissions Trading System resulted in power and manufacturing plants reducing their emissions by 2 percent from 2011 to 2012. The 12,000 installations covered by the ETS emitted 1.905 billion metric tons of carbon dioxide in 2011 and 1.867 billion metric tons in 2012. Aviation figures were not included in the announcement since 2012 was the first year the ETS began covering flights within the EU; intercontinental flights will begin reporting emissions levels in 2013. While the reductions fulfill the purpose of the ETS, they worsened the surplus of ETS carbon permits. By the end of 2012, there was a 2 billion allowance surplus, almost doubled from the previous year.