;Index level;Percentage change;Percentage change; 4th quarter 2019 - 1st quarter 2020;1st quarter 2019 - 1st quarter 2020; Cost index for diesel-powered buses;106.2;-0.2;3.0; ;;;; Sub index;;;; Labour costs;105.4;-0.9;2.6; Auto diesel;104.2;-0.1;0.7; Depreciation;111.9;3.8;7.5; Real interest rate;157.2;-11.6;25.7; Repair and maintenance costs;105.2;0.6;3.3; Administrative costs;103.8;-0.8;0.4;