The BSE benchmark Sensex rose by over 234 points in the opening trade today. This follows robust export figures and better-than-expected expansion of the economy.The 30-share index which had gained 713 points in last three sessions rose to reach 20,084 level in first five minutes of trading.Likewise, the wide-based National Stock Exchange Nifty index moved up by 69 points to 6,030 points, buoyed by the news of a 21.3 per cent rise in exports for the six months spanning April-October this year.In other Asian markets, Hong Kong's Hang Seng Index Japan's Nikkei Index were up by 1.13 per cent and 1.78 percent, respectively.In the US, the Dow Jones Industrial Index ended 2.27 per cent high than its previous close.