council decis novemb amend decis ec extern auditor nation central bank extern auditor banqu central du luxembourg ec council european union regard protocol statut european system central bank european central bank annex treati establish european commun articl thereof regard recommend ecb european central bank octob council european union extern auditor banqu central du luxembourg account european central bank ecb nation central bank audit independ extern auditor recommend govern council ecb approv council european union mandat current extern auditor banqu central du luxembourg expir end govern council ecb recommend council approv appoint start financi year renew period year extern auditor banqu central du luxembourg select accord public procur rule follow recommend govern council ecb decid articl articl decis ec replac quot deloitt amp touch luxembourg approv extern auditor banqu central du luxembourg financi year renew period year quot articl decis notifi ecb articl decis publish offici journal european union brussel novemb council presid marzano oj oj decis amend decis ec oj