Spaniards overwhelmingly endorsed the European Union (EU) constitution on Sunday in a referendum, initial results showed.

According to the Interior Ministry, with 99.8 percent of the votes counted, 76.7 percent of the voters supported the constitution, and only 17.3 percent voted against it.

Spanish Prime Minister Jose Luis Rodriguez Zapatero said he was "satisfied" with the referendum results, hailing it as a "great victory" for both Spain and the EU.

A total of 14 million Spaniards took part in the historic voting. The turnout for the referendum stood at 42.3 percent.

Source: Xinhua