Case T-299/08: Judgment of the General Court of 17 May 2011 — Elf Aquitaine v Commission (Competition — Agreements, decisions and concerted practices — Market in sodium chlorate — Decision finding an infringement of Article 81 EC and Article 53 EEA — Imputability of the infringement — Rights of the defence — Obligation to state reasons — Principle that penalties must fit the offence — Principle that penalties must have a proper legal basis — Presumption of innocence — Principle of sound administration — Principle of legal certainty — Misuse of powers — Fines — Aggravating circumstance — Deterrence — Mitigating circumstance — Cooperation during the administrative procedure — Significant added value)