Bihar on Monday released data from a caste-based survey that indicates 36 per cent of the population are from Extremely Backward Classes, 27.1 per cent are from Backward Classes, 19.7 per cent are from Scheduled Castes and 1.7 per cent are from Scheduled Tribes. The general population accounts for the remaining 15.5 per cent. The state's population is over 13.1 crore.