The Sensex at the Bombay Stock Exchange surged 266 points, or 1.3 percent, to close above the 20,000-mark, at 20,249, on Wednesday, after the trade deficit narrowed to its lowest level in 30 months. The Nifty at the National Stock Exchange jumped 79 points, or 1.3 percent, to 6,007.Stock markets in Japan, China and Singapore rose between 0.3 percent and 1 percent.