73As regards the frequency of the penalty payment, in accordance with the Commission’s proposal, given that the provision of evidence of the compliance with Directive 91/271 may require a certain amount of time and in order to take account of any progress made by the defendant Member State, the Court considers it appropriate for the penalty payment to be calculated on the basis of six-month periods, reducing the total relating to such periods by a percentage corresponding to the proportion representing the number of p.e.s which have been brought into compliance with the judgment in Commission v Belgium.
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