In terms of volume, export declined 12.6 percent in April from a year earlier, according to the Bank of Korea (BOK).
It was the biggest monthly reduction in over 11 years since January 2009, marking the first fall in three months.
Export volume for transport equipment plunged 39.5 percent last month, and shipment for computer, electronic and optical devices slipped 7.5 percent.
In terms of value, export dropped 22.8 percent in April from a year earlier, posting the fastest slide in almost 11 years since July 2009.
The double-digit drop came as the coronavirus pandemic weakened overall trade across the globe.
Import volume fell 1.5 percent last month. In terms of value, import tumbled 15.5 percent on lower crude oil price.
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