Traders work on the floor of the New York Stock Exchange (NYSE) in New York City, U.S., September 15, 2016. REUTERS/Brendan McDermid

German Chancellor and chairwoman of the Christian Democratic Union (CDU) Angela Merkel reacts before a party leadership meeting in Berlin, Germany, September 19, 2016. REUTERS/Fabrizio Bensch

German Chancellor Angela Merkel arrives for a meeting at the lower house of parliament in Berlin, Germany, September 6, 2016. REUTERS/Stefanie Loos

German Chancellor and chairwomen of the Christian Democratic Union (CDU) Angela Merkel addresses a news conference in Berlin, Germany, September 19, 2016. REUTERS/Fabrizio Bensch

German Chancellor and chairwomen of the Christian Democratic Union (CDU) Angela Merkel and top candidate for the Berlin city-state elections Frank Henkel (L) leave a news conference in Berlin, Germany, September 19, 2016. REUTERS/Fabrizio Bensch

Florida Gov. Rick Scott speaks at a press conference about the Zika virus in Doral, Florida, U.S. August 4, 2016. REUTERS/Joe Skipper/File Photo

A woman looks on prices at a food market in Rio de Janeiro, Brazil, January 21, 2016. REUTERS/Pilar Olivares/File Photo

Philippine President Rodrigo Duterte arrives at the military's Camp Tecson to talk to soldiers in San Miguel, Bulacan in northern Philippines September 15, 2016. REUTERS/Erik De Castro