SEOUL, Jan 11 (Reuters) - South Korea's exports during the first 10 days of January dropped 15.4% from a year earlier, customs agency data showed on Monday, as shipments to both China and the United States declined.

Imports slumped 22.9% from a year earlier, while average exports per working day saw a gain of 5.8%.

Data for the full month will be released on Feb. 1, 2021. (Reporting by Cynthia Kim; Editing by Tom Hogeu)