Ducati attributes this growth to the ever-expanding product line, led by the sold-out Diavel. This was the sixth-consecutive quarter of growth for Ducati, and it makes North America the Italian company's top market for for the first time ever. BMW Motorrad USA reported sales up 7.4 percent in 2011, double the gain of the previous year. BMW's best-selling S1000RR superbike, and the new K1600GT and GTL tourers gave numbers a push near the end of the year. Triumph, meanwhile, boasted a 15 percent U.S. sales increase during the second half of 2011, primarily driven by the release of its Tiger 800 and 800 XC adventure-tourers.