U.S. college endowments suffered their biggest loss since the financial crisis, dragged down by global stocks, hedge funds and natural resources, according to an industry survey released Tuesday. The 1.9 percent average loss reported by the National Association of College and University Business Officers and money manager Commonfund in Wilton, Connecticut, for the year ended June 30, compared with a nearly 4 percent gain, with dividends, in the S&P 500 Index. In the prior 12-month period, schools saw a 2.4 percent return on average. The 10-year average return fell to 5 percent as a result of the tepid performance, well...