For carbon dioxide, methane and nitrous oxide (99 % of all emissions) 1990 is used as the 'base year' for all EU-15 Member States.
I ndáil le déocsaíd charbóin, meatán agus ocsáid nítriúil (99 % de na hastuithe go léir) úsáidtear 1990 mar 'bhonnbhliain' do gach Ballstát an AE-15.