Shiller 20-city home price index fell 18.1 percent in April from a year ago, but the annual declines are slowing each month, suggesting the battered housing market may be ready to stabilize. Light sweet crude oil for August delivery fell $1.60 to $69.89 a barrel on the New York Mercantile Exchange. The U.S. dollar rallied versus the euro and the yen, dragging down dollar-denominated oil and commodities. The Dow Jones industrial average fell 82.38, or 1 percent, to 8,447.00. Exxon Mobil and Chevron fell along with declining oil prices. The broader S&P 500 index fell 7.91, or 0.85 percent, to 919.32. The Nasdaq composite index fell 9.02, or 0.5 percent, to 1,835.04. The New York Stock Exchange composite index fell 57.35 to 5,905. The American Stock Exchange composite index fell 11.24 to 1,582.04. And the Russell 2000 index fell 2.33 to 508.28.