Men talk at the Monday market in the Basque town of Guernica, northern Spain, September 19, 2016. Picture taken September 19, 2016. REUTERS/Vincent West

Tourists take pictures in front of the new Oak of Guernica at the assembly house in the Basque town of Guernica, northern Spain, September 21, 2016. REUTERS/Vincent West

Silver voting balls in the form of acorns dating back to the seventeenth century are displayed at the assembly house in the Basque town of Guernica, northern Spain, September 21, 2016. REUTERS/Vincent West

A customer talks to a stallholder at the Monday market in the Basque town of Guernica, northern Spain, September 19, 2016. Picture taken September 19, 2016. REUTERS/Vincent West

Turkey's Central Bank headquarters in Ankara, Turkey, April 19, 2015. REUTERS/Umit Bektas

A customer counts his Egyptian 50 pound notes at an exchange office in downtown Cairo, Egypt, April 19, 2016. REUTERS/Amr Abdallah Dalsh

Central Bank of Egypt's headquarters is seen in downtown Cairo, Egypt, September 19, 2016. REUTERS/Mohamed Abd El Ghany

Brazil's Finance Minister Guido Mantega arrives at the Ministry of Finance in Brasilia December 4, 2014. REUTERS/Ueslei Marcelino