Japan booked its first current account surplus in five months in February as an increase in investment income exceeded a trade shortfall, dpa cited the government as saying Tuesday. The surplus stood at 612.7 yen (5.95 billion dollars), down 5.7 per cent from a year earlier, the Finance Ministry said in a preliminary report. Japan's surplus on the primary income account climbed 3.6 per cent to 1.46 trillion yen while it posted a trade deficit of 533.4 billion yen, the ministry said. A weaker yen has driven up import costs as the country imported more petroleum and liquefied natural gas for thermal power generation due to the shutdown of nuclear reactors following its worst nuclear accident at the Fukushima Daiichi Nuclear Power Station in 2011.