FRANKFURT, May 20 (Reuters) - The euro zone’s current account surplus narrowed in March on a drop in the surplus from the trade of goods and services, European Central Bank data showed on Thursday. The bloc of 19 countries sharing the euro recorded an adjusted current account surplus of 17.8 billion euros in March, down from 25.9 billion euros in February but up from the 10.4 billion registered a year earlier, according to adjusted figures. Based on unadjusted data, the surplus widened to 31.0 billion euros from 13.2 billion euros. In the 12 months to March, the current account surplus was 2.4% of the bloc’s GDP, up from 2.1% in the preceding 12 month period. (Reporting by Balazs Koranyi Editing by Francesco Canepa) Our Standards: The Thomson Reuters Trust Principles.