South Korea's current account surplus hit a three-year high in April as exports grew faster than imports, central bank data showed on Friday, helping push the won up sharply to a fresh 3-week high against the dollar.

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The current account surplus rose to a seasonally adjusted $2.75 billion in April, the biggest since a $3.54 billion profit in January 2005, from a revised $77.3 million surplus in March, the Bank of Korea said.