Federal Reserve Chair Janet Yellen Semiannual Monetary Policy Report To The Senate Banking Committee [Getty Images]

Janet Yellen, chair of the U.S. Federal Reserve, takes off her glasses during a Senate Banking Committee hearing in Washington, D.C., U.S., on Thursday, Feb. 11, 2016. Yellen said yesterday the Federal Reserve still expects to raise interest rates gradually while making it clear that continued market turmoil could throw the central bank off course from the multiple increases that policy makers have forecast for 2016. Photographer: Andrew Harrer/Bloomberg via Getty Images

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