Natural-gas futures sank to near a seven-week low Thursday on news of the year’s largest stockpile addition. Natural gas for June delivery lost 11.4 cents, or 2.6%, to close at $4.359 a million British thermal units on the New York Mercantile Exchange. Two days of losses have pushed down futures to within 0.1 cent of the seven-week low closing price they hit May 13. Prices have been falling as surplus natural gas has steadily increased from an 11-year low, a trend that is still strengthening, federal analysts said Thursday. Producers added 106 billion cubic feet of gas to storage for the week ended May 16, the U.S. Energy Information Administration said. That is 3 bcf more than what 21 traders, brokers and analysts forecasted in a Wall Street Journal survey. It was also about 16 bcf more than what usually gets added to storage at […]