70In so far as concerns the applicant’s claim that the Court should declare the contested decision non-existent, it must be recalled that, according to the case-law of the Court of Justice, acts of the institutions of the European Union are in principle presumed to be lawful and accordingly produce legal effects, even if they are tainted by irregularities, until such time as they are annulled or withdrawn (Case C-137/92 PCommission v BASF and Others [1994] ECR I-2555, paragraph 48, Case C-227/92 PHoechst v Commission [1999] ECR I-4443, paragraph 69, and Case C-475/01Commission v Greece [2004] ECR I-8923, paragraph 18).