The Sensex at the Bombay Stock Exchange declined 148 points, or 0(point)5 percent, to close at 31,662 and the Nifty at the National Stock Exchange dropped 36 points, to 9,916.Key regional markets in Japan, Hong Kong, Singapore and South Korea lost between 0.1 percent and 0.6 percent.At the forex market, the rupee appreciated 2 paise, to 64.10 against the dollar. Snapping three days of gains, gold declined 50 rupees, to 30,550 rupees per ten grams in Delhi.And Brent crude oil futures climbed 28 cents, to 53.66 dollars a barrel.