Euro banknotes and coins are issued by different institutions: banknotes are issued by the national central banks, under the aegis of the ECB; coins are issued by the national mints. In France, the Banque de France is responsible for putting coins into circulation on behalf of the Treasury. Once issued, banknotes circulate through the economy and come back to the Banque de France to be sorted. Good banknotes are put back into circulation; unfit banknotes are destroyed and replaced with new ones. A portion of the banknotes in circulation (about 20%) follow a shorter circuit, as they are sorted and recirculated directly by banks or cash-in-transit companies, under the supervision of the Banque de France.