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Note 26 - Common Stock (Tables)
12 Months Ended
Dec. 31, 2018
Common Stock  
Disclosure Capital Increase Explanatory
Capital Increase
Number of SharesCommon Stock(Millions of Euros)
As of December 31, 20156.366.680.1183.120
Dividend option - April 2016113.677.80756
Dividend option - October 201686.257.31742
As of December 31, 20166.566.615.2423.218
Dividend option . April 2017101.271.33850
As of December 31, 20176.667.886.5803.267
As of December 31, 20186.667.886.5803.267