U.S. Federal Reserve Chair Janet L. Yellen participates in a roundtable discussion with Federal Reserve Bank of Philadelphia President Patrick Harker and members of the West Philadelphia Skills Initiative in Philadelphia, Pennsylvania, U.S., June 6, 2016. REUTERS/Charles Mostoller/File Photo

U.S. Federal Reserve Chair Janet L. Yellen participates in a roundtable discussion with Federal Reserve Bank of Philadelphia President Patrick Harker and members of the West Philadelphia Skills Initiative in Philadelphia, Pennsylvania, U.S., June 6, 2016. REUTERS/Charles Mostoller/File Photo

U.S. Federal Reserve Chair Janet L. Yellen participates in a roundtable discussion with Federal Reserve Bank of Philadelphia President Patrick Harker and members of the West Philadelphia Skills Initiative in Philadelphia, Pennsylvania, U.S., June 6, 2016. REUTERS/Charles Mostoller/File Photo

June 15, 2016 2:21 PM (UTC+8)