Year to date, the benchmark iShares US Energy Exchange-Traded Fund has declined 3.85%, and the iShares US Oil Equipment & Services ETF has fallen nearly 1%, compared with a gain of 3.16% for the S&P 500. For full-year 2016, the IYE gained 22.9%, and the IEZ 25.6%, compared with about 10% for the S&P 500.