United Parcel Service air craft are being loaded with air containers full of packages bound for their final destination at the UPS Worldport All Points International Hub during the peak delivery month in Louisville, Kentucky December 3, 2015. REUTERS/John Sommers II

Birds are seen on the logo of generic drugmaker Perrigo Co outside their new factory in the city of Yeruham, in southern Israel March 2, 2016. REUTERS/Amir Cohen

People wait in a queue to buy staple items and basic food at a sidewalk near a supermarket in Caracas, Venezuela September 14, 2016. REUTERS/Henry Romero

People wait in a queue to buy staple items and basic food at a sidewalk near a supermarket in Caracas, Venezuela September 14, 2016. REUTERS/Henry Romero

People stand in line as they wait to buy staple items and basic food outside a supermarket in Caracas, Venezuela September 14, 2016. REUTERS/Henry Romero

People gather to buy staple items and basic food outside a supermarket in Caracas, Venezuela September 14, 2016. REUTERS/Henry Romero

People wait in a queue to buy staple items and basic food at a sidewalk near a supermarket in Caracas, Venezuela September 14, 2016. REUTERS/Henry Romero

An opposition supporter takes part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro, in Caracas, Venezuela, September 16, 2016. REUTERS/Henry Romero