TIANJIN -- Volkswagen posted slightly weaker auto sales in China in 2015 compared with a year earlier, but demand for its luxury cars remained resilient.

Sales of Volkswagen models dropped 4.6 percent in China to 2.63 million units in 2015. Audi sales edged down 1.4 percent to 570,000 units.

However, its luxury cars continued to post strong growth. Porsche sales went up 23.6 percent to 58,000 units during the same period, while Lamborghini sold 17.8 percent more to 278 units.

Total auto sales, including vehicles made by Volkswagen's two joint ventures with SAIC Motor and China FAW Group and those imported to China, stood at 3.55 million units for 2015, slightly down from 3.68 million a year ago.

Jochem Heizmann, CEO of Volkswagen China, said that the automaker's future China business will focus on sport utility vehicles, electric cars and smart connectivity.

The automaker also plans to offer 21 different models for the Chinese market.