council decis april conclus protocol access costa rica gener agreement tariff trade eec council european commun regard treati establish european econom commun articl thereof costa rica enter negoti commun contract parti gener agreement tariff trade gatt view access agreement result negoti accept commun decid articl protocol access costa rica gener agreement tariff trade approv behalf european econom commun text protocol attach decis articl presid council author design person empow sign protocol order bind commun luxembourg april council presid reynold