Case T-250/12: Judgment of the General Court of 6 October 2015 — Corporación Empresarial de Materiales de Construcción v Commission (Competition — Agreements, decisions and concerted practices — Sodium chlorate market in the EEA — Amending decision reducing the determined duration of participation in the cartel — Calculation of the amount of the fine — Whether time-barred — Article 25 of Regulation No 1/2003)