BMW just announced that it's going to increase the number of vehicles it produces at its plant in Spartanburg, South Carolina by 50% by 2012. This will take the total number of cars produced there per year to 240,000. This means an additional investment of $750 million will be made in South Carolina and 500 additional employees will be added. Vehicles produced there include the X3, X5 and Z4. The next generation X3 and new X6 will be added to that list. The US is BMW's most important market, with nearly one quarter of all vehicles it produces being sold here.