Snapping a four-session winning streak, the Sensex at the Bombay Stock Exchange declined 93 points, or 0.5 per cent, to close at 19,691, on profit-booking by investors, amid subdued global markets, on Monday. The Sensex had climbed nearly 360 points in the previous four trading sessions. The Nifty at the National Stock Exchange fell 28 points, or 0.5 percent, to 5,988.Stock indices in Japan, Hong Kong, South Korea and Singapore ended weak.