Mexico produces the most automobiles of any North American nation. The industry produces technologically complex components and engages in some research and development activities. The "Big Three" (General Motors, Ford and Chrysler) have been operating in Mexico since the 1930s, while Volkswagen and Nissan built their plants in the 1960s. In Puebla alone, 70 industrial part-makers cluster around Volkswagen. In the 2010s expansion of the sector was surging. In 2014 alone, more than $10 billion in investment was committed. In September 2016 Kia motors opened a $1 billion factory in Nuevo León, with Audi also opening an assembling plant in Puebla the same year. BMW, Mercedes-Benz and Nissan currently have plants in construction.