The international trade balance unexpectedly shrank in August by 3.6% to a $30.7 billion deficit as petroleum imports declined to the lowest dollar amount in almost 10 years, the Commerce Department reported Friday.

The U.S. exported $128.2 billion of goods and services while it imported $158.9 billion for the month. The trade deficit in July was revised lower to $31.9 billion from the initially reported $32.0 billion. Economists expected the trade deficit to grow to $33.0 billion for the month, according to the median estimate from Thomson Reuters.

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