Japan's current account surplus in May saw a nearly 2.5-fold increase from a year earlier to 1.86 trillion yen ($13 billion), helped by record investment returns for the month and a smaller trade deficit due to a sharp drop in energy imports, government data showed Monday.Exports, a key driver of the Japanese economy, marked their first year-on-year drop in 27 months amid fewer shipments to China and concern about slowing global economic growth. In all, Japan's trade deficit shrank 38.8 percent to 1.19 trillion yen.The country was in the black for the fourth straight month, with returns on …READ FULL ARTICLE