South Korea's exports may lose some steam in the second quarter this year, staying roughly on par with the first quarter's gains, a survey of foreign buyers and trade representatives showed Thursday, The country's overall exports in the January-March period grew 2.2 percent. The leading export index compiled by the state-run Korea Trade-Investment Promotion Agency (KOTRA) came to 51.9 for the second quarter, down 0.8 point from the previous three-month period and just higher than the break-even 50 point mark.