The United States government slashed its forecast for crude oil production in 2017 on Tuesday, the latest sign that a 19-month price rout is taking a deeper toll on drillers. In its short-term energy outlook, the United States Energy Information Administration said that 2017 oil production would fall by 480,000 barrels a day to 8.19 million barrels, a big jump from last month’s forecast of a decline of 230,000 barrels a day. The decline forecast for 2016 also increased, but not by much: a decline of 760,000 barrels a day from 740,000 barrels. Since mid-2014, global oil benchmark prices have dropped more than 70 percent. The agency also said that growth in demand was dropping, too.