The import price index stood at 147.95 in April, down 0.9 percent from the previous month, according to the Bank of Korea (BOK).
It was the first slide in four months amid the lower crude oil price. Dubai crude, South Korea's benchmark, averaged 102.8 U.S. dollars per barrel in April, down 7.3 percent from the prior month.
Price for imported mining products declined 2.7 percent in April on a monthly basis, and the reading for oil products and coal retreated 5.5 percent.
The import price for agricultural, livestock and fishery products gained 1.9 percent, and the price for primary metal products advanced 2.2 percent.
Meanwhile, the export price index came in at 126.81 in April, up 1.0 percent from a month earlier. It kept an upward trend for the fourth consecutive month.
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