A driver checks his McLaren taxi after a photoshoot for taxi-booking app GrabTaxi's fleet of seven luxury cars in Singapore September 15, 2015. REUTERS/Edgar Su/File Photo

Bank of Italy Governor Ignazio Visco attends the session 'Recharging Europe' in the Swiss mountain resort of Davos January 23, 2015. REUTERS/Ruben Sprich

Emma Walmsley of GlaxoSmithKline poses in this undated photograph released in London on September 20, 2016. Courtesy of GlaxoSmithKline/Handout via REUTERS

The logo of the Organization of the Petroleum Exporting Countries (OPEC) is pictured at its headquarters in Vienna, Austria, May 30, 2016. REUTERS/Heinz-Peter Bader

A Muslim woman wears a burkini, a swimsuit that leaves only the face, hands and feet exposed, on a beach in Marseille, France, August 17, 2016. REUTERS/Stringer/File Photo

A car is filled with gasoline at a gas station pump in Carlsbad, California August 4, 2015. REUTERS/Mike Blake

Congolese opposition supporters chant slogans during a march to press President Joseph Kabila to step down in the Democratic Republic of Congo's capital Kinshasa, September 19, 2016. REUTERS/Kenny Katombe

Congolese opposition supporters chant slogans as they destroy the billboard of President Joseph Kabila during a march to press the President to step down in the Democratic Republic of Congo's capital Kinshasa, September 19, 2016. REUTERS/Kenny Katombe