The Sensex at the Bombay Stock Exchange declined 169 points, or 1 percent, to 17,584, today, on profit-booking by investors, amid weak Asian markets. The Nifty at the National Stock Exchange fell 45 points, or 0.8 percent, to 5,340. Public sector oil major, ONGC fell 1.9 per cent, after an initial spike, as bids came in for the auction for sale of 5 percent government stake in the energy giant.Stock markets in Japan, China, Hong Kong, and Singapore lost between 0.1 percent and 1.4 percent, after US central bank chairman Ben Bernanke dashed hopes of additional quantitative easing.