Craft beer sales climbed 15 percent during the first half of this year, the Brewers Association reported Monday. The trade association in Boulder, Colo., also reported that the volume of craft beer sold jumped 14 percent to an estimated 5.1 million barrels, compared to 9 percent growth during the same period last year. "Craft brewers continue to innovate and brew beers of excellent quality," Brewers Association Director Paul Gatza said in a prepared statement. "America's beer drinkers are rapidly switching to craft because of the variety of flavors they are discovering. And they are connecting with small and independent craft brewers as companies they choose to support." Part of the reason for the sales and volume growth clearly involves growth in the craft beer industry. The U.S. has 1,790 breweries — an increase of 165 breweries since June 2010.