recommend european central bank march council european union extern auditor deutsch bundesbank ecb govern council european central bank regard statut european system central bank european central bank articl thereof account european central bank nation central bank eurosystem audit independ extern auditor recommend govern council approv council european union pursuant council decis march amend decis ec extern auditor nation central bank ec ernst amp young deutsch allgemein treuhand ag kpmg deutsch treuhand gesellschaft ag approv extern auditor deutsch bundesbank annual account start financi year deutsch bundesbank decid maintain ernst amp young deutsch allgemein treuhand ag sole extern auditor annual account start financi year deutsch bundesbank consid advis extern auditor appoint annual account start financi year request ecb recommend appoint auditor deutsch bundesbank select propos auditor accord public procur rule applic deutsch bundesbank ecb consid propos auditor fulfil requir recommend pwc deutsch revis ag extern auditor deutsch bundesbank addit continu mandat ernst amp young deutsch allgemein treuhand ag financi year renew period year recommend publish offici journal european union frankfurt main march presid ecb willem duisenberg oj