Article 18

1. For the purposes of this Directive, the ECU shall be that defined by Regulation (EEC) No 3180/78 (1), as amended by Regulation (EEC) No 2626/84 (2). The equivalent in national currency shall initially be calculated at the rate obtaining on the date of adoption of this Directive.
2. Every five years the Council, acting on a proposal from the Commission, shall examine and, if need be, revise the amounts in this Directive, in the light of economic and monetary trends in the Community.