Snapping two days of gains, the Sensex at the Bombay Stock Exchange declined a marginal 22 points, or 0.1 per cent, to close at 19,454, on Thursday, on profit-booking by investors. The Sensex had advanced over 230 points in the previous two trading sessions. The Nifty at the National Stock Exchange lost 13 points, or 0.2 percent, to 5,916.But stock markets in China, Hong Kong, South Korea and Singapore rose between 0.2 percent and 0.5 percent.