Såfremt det underliggende økonomiske fænomen eksisterer , men ikke overvåges statistisk , og der derfor ikke kan tilvejebringes nationale estimater , kan de nationale centralbanker vælge enten at undlade at indberette tidsserien eller indberette den som manglende .
Where actual data are unavailable or cannot be processed , national estimates shall be provided . Where the underlying economic phenomenon exists but is not monitored statistically and therefore national estimates cannot be provided , NCBs may choose either not to report the time series or to report it as missing .