Open-ended contract employees (average annual % of total workforce) Training hours (average, per capita) 24.3* 33.2* 23.0* 23.0* 28.1* 27.5* 26.4 28.0 31.4 29.3 Workforce attending at least one training course (%) 92.1%* 97.6%* 93.4%* 96.0%* 95.6%* 97.1%* 97.3% 96.9% 99.3% 98.1% Accident frequency index (number of accidents/hours worked x 1,000,000) 43.6 42.1 35.1 30.4 25.4 25.5 23.9 22.6 20.6 17.8 Internal climate index (score 0-100) 53* - 58* - 64* - 61* - 63 - Index of customer satisfaction for residential customers (score 0-100) 65* 67* 69* 69* 70* 69* 70** 69* 70* 70* Compliance with AEEGSI and Service Charter quality standards (gas.