FRANKFURT--The euro zone's current-account surplus narrowed in May, according to data published Friday by the European Central Bank.

The current-account balance, a broad measure of an economy's international financial position, decreased in adjusted terms to a surplus of 19.5 billion euros ($26.4 billion) in May from EUR21.6 billion in April.

For the 12-month period that ended in May 2014, the cumulated surplus was 2.4% of the euro zone's gross domestic product, higher than the 2% in the 12 months to May 2013.

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July 18, 2014 04:55 ET (08:55 GMT)

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