The BSE benchmark Sensex shot up by over 187 points in the opening trade on Monday to 20,632. This is the highest point in nearly 33 months.The sensex was trading at 20,668 up by 223 points a short while ago. Anlaysts said the rise in the sensex is due to strong FII inflows and firm Asian markets.Similarly, the wide-based National Stock Exchange gained 58 points to cross 6,200 points level at 6,201 in the early trade. It was tarding at 6215, up by 71 points a short while ago.