The Sensex at the Bombay Stock Exchange declined 302 points, or 1.8 percent, to 16,151, on investor anxiety over corporate earnings, and amid weak global markets, today. The Nifty at the National Stock Exchange slipped 94 points, or 1.9 percent, to 4,850.Stock markets in Japan, Hong Kong, and Singapore slumped between 1.8 percent and 4.4 percent, on rising concerns about a Greek sovereign default.