MUMBAI: Tata Motors has reported sales of commercial vehicles in December at 18,730 units against 18,467 vehicles sold in the same period last year. In the passenger vehicle segment, the company has reported a 35.4 per cent increase in demand in the domestic market at 13,037 units. Sales from exports during the month decreased marginally to 3,831 units from 3,857 units in December 2004.