At the stock markets, the Sensex at the Bombay Stock was trading over 150 points down in afternoon trade today. The 30-share index, which retreated from its record high level this morning, was trading 161 points in the negative territory at 36,122, a short while ago. The Nifty at the National Stock Exchange was trading 61 points down at 11,069.At the foreign exchange market, the rupee fell by 20 paise to trade at 63 rupees 98 paise against the dollar in afternoon deals.