These were the worst performing ETFs of the week.
ERUS — iShares MSCI Russia ETF -66.42%
BOIL — ProShares Ultra Bloomberg Natural Gas -17.46%
MEXX — Direxion Daily MSCI Mexico Bull 3X Shares -14.02%
UNG — United States Natural Gas Fund LP -11,38%
LABD — Direxion Daily S&P Biotech Bear 3x Shares -8.73%