In the 12 months to November, the surplus was 3.1 percent of the bloc's gross domestic product, down from 3.2 percent in the preceding 12-month period, with the trade surplus narrowing even more.

The surplus, which the U.S. administration has labelled excessive, is expected to drop to 2.7 percent of GDP this year, then further to 2.5 percent by 2021, according to ECB projections.

(Reporting by Balazs Koranyi; editing by John Stonestreet)