Exxon Mobil Corp. ’s quarterly cash flow fell to its lowest level since 2009, as the plunge in oil prices led the company to pile on debt and spend less money buying back its shares. The largest U.S. energy company reported a $6.57 billion profit for the last three months of 2014, a 21% decrease from a year earlier, on revenue of $87.28 billion. Earnings per share of $1.56 beat analysts’ expectations. The company’s stock was up less than 1%, to about $88, in midday trading. Exxon pumped slightly less than four million barrels a day of oil and gas in 2014, the least since 2009 and the third consecutive year output has declined. The company said it met its production goal and completed projects from Russia to Canada that will add up to 250,000 […]