Description:Europe's biggest car maker has hit the accelerator pedal in China. Volkswagens' planning a new assembly plant there aimed at doubling capacity to over 4 million vehicles by 2018. The announcement came as the company released its annual report. Operating profit at the group's main VW brand fell 4 percent last year to 3.6 billion euros. CEO Martin Winterkorn said that's largely down to a fall in demand in Europe.(1:31)