South Korea's exports extended on-year gains to seven consecutive months in April, buoyed by robust chip demand, with shipments of automobiles also setting a fresh high, data showed Wednesday. Outbound shipments increased 13.8 percent on-year to $56.2 billion last month, according to the data compiled by the Ministry of Trade, Industry and Energy. Imports gained 5.4 percent on-year to $54.7 billion last month, resulting in a trade surplus of $1.53 billion. South Korea has been maintaining a