The BSE benchmark Sensex declined by over 84 points in early trade today .The 30-share barometer, which has lost almost 168 points in the last two trading days, moved down further by 84.35 points, or 0.49 per cent, to 17,066.84.Similarly, the broad-based National Stock Exchange Nifty index declined by 24.75 points, or 0.48 per cent, to 5,163.65.