The Group appealed the sanction that was revoked on appeal lodged by Ercros. a) Accident rate In 2017, the Group’ accident rate decreased, as shown by the evolution of the general accident frequency index —which is the most ambitious index since it measures the number of accidents, with and without leave, of internal and outsourced staff— that dropped from 2.48 in 2016 to 3.11 in 2017.