Judgment of the Court of First Instance of 21 October 2003 in Case T-368/00: General Motors Nederland BV and Opel Nederland BV v Commission of the European Communities (Competition — Distribution of motor vehicles — Article 81 EC — Regulations (EEC) No 123/85 and (EC) No 1475/95 — Partitioning of the market — General strategy aimed at restricting exports — Restriction of supply — Restrictive bonus policy — Ban on exports — Fine — Gravity and duration of the infringement — Proportionality — Guidelines for the calculation of fines)