Natural-gas prices rose to a two-month high after government data showed a smaller-than-expected storage addition for last week. The U.S. Energy Information Administration said natural-gas stockpiles grew by 2 billion cubic feet in the week ended Friday, compared to the 7.8 bcf expected by forecasters surveyed by The Wall Street Journal. The report is a widely watched measure of supply and demand. A smaller-than-expected addition to…