The National Stock Exchange's index Nifty today breached 6,100 level after two years on the back of steady capital inflows amid strong corporate earnings. The wide-based Nifty rose by 19 points, to trade at 6,101 points, a level not seen since January, 2011. However, profit booking emerged at two-year high levels and the sensitive index slipped to trade at 6,099 points in late morning deals. Brokers said, steady inflow of capital inflows by foreign funds driven by the government's decision to deregulate diesel prices in a key economic reform measure, and better-than- estimated third quarter earnings by some blue-chip companies, helped Nifty to cross 6,100-level. Meanwhile, the Sensex at the Bombay Stock Exchange was trading up 36.12 points at 20.138 when reports last came in.