commiss regul ec amend regul ec lai detail rule applic agrimonetari system euro agricultur commiss european commun regard treati establish european commun regard council regul ec decemb establish agrimonetari arrang euro articl thereof articl commiss regul ec amend regul ec exchang rate convers nation currenc aid hectar amount structur environment charact averag exchang rate applic month preced date oper event calcul pro rata tempori averag calcul laid regul ec amend measur provid regul accord opinion manag committe concern adopt regul articl sentenc ad articl regul ec quot averag exchang rate fix commiss month date oper event quot articl regul enter forc dai public offici journal european union regul bind entireti directli applic member state brussel commiss franz fischler member commiss oj oj oj