Natural-gas prices jumped more than 2% on data that showed producers added less gas than expected to stockpiles. U.S. gas inventories rose by 105 billion cubic feet in the week ended May 9, the U.S. Energy Information Administration said Thursday. However, that figure includes 8 bcf that storage operators had previously used to run their facilities, a one-time addition that many traders discounted. The remaining 97 bcf addition was below forecasts. Traders use the data to measure how quickly producers are rebuilding stockpiles depleted during a frigid winter. Inventories now stand at about 1.2 trillion cubic feet, 46% below the five-year average. Gas for June delivery jumped 2.3% to $4.469 a million British thermal units on the New York Mercantile Exchange. Producers need to beat the five year average storage additions by 20 to 35 bcf each week for the next six months in order […]