Green Mountain Coffee K-Cups are displayed at the company's visitor center and cafe in Waterbury, Vermont. Photo: Herb Swanson/Bloomberg By Chris Prentice Bloomberg February 18, 2011 Coffee extended a rally to the highest since 1997 on signs that global demand will outstrip production as investors snapped up shares of U.S. retailers including Starbucks Corp. in a bet that sales will increase. Green Mountain Coffee Roasters Inc., the largest U.S. seller of single-serve brewers, trades in New York at 295 times cash flow, more than any company in the Standard & Poor’s 500 Index, according to Bloomberg data. Arabica-coffee futures have doubled in the past year as adverse global weather slashed supplies including in Brazil, the world’s biggest producer. Consumers are drinking more coffee in the past year as demand has rebounded amid the global economic recovery. Inventories monitored by ICE Futures U.S. have plunged to the lowest since April 2000. Green Mountain shares hav...