India's benchmark stock index tumbled 11 percent Friday, its second-largest fall ever, amid worries about a global recession and investor disappointment that the central bank left interest rates unchanged, AP reported. The Sensex index fell 1,070.63 points, or 10.96 percent, to 8,701.07, its lowest level since December 2005. On the broader National Stock Exchange, the 50-company S&P Nifty index dropped 12.2 percent to 2,584 points.