Management (executive management, senior management and management) 2% 1% 2% 1% 2% Operational (production and maintenance) 51% 78% 46% 86% 45% Supervisors, administration and technical 17% 3% 14% 5% 14% Contractors 3% 30% 18% 38% 8% 39% Average training hours per worker (employees and contractors) 77 41 63 47 40 66 7.6.