The Sensex at the Bombay Stock Exchange was trading 67 points down at 20,598 points a shortwhile ago. It declined 183 points in early trade today, as funds and retail investors engaged in reducing positions amid a weakening rupee. The 30-share barometer had lost 573 points in the past four sessions.Similarly, the National Stock Exchange index Nifty was also trading 26 points down at 6,114 points a shortwhile ago.