With story BC-HOUSING-MARKET-NYT -- When prices fall far enough, buyers will appear. That seems to have been the story of the American housing market in 2009. The number of existing homes that changed hands in 2009 -- 4.6 million -- was up 5 percent from the previous year. It was the first annual increase since 2005. HOUSING_Prices -- 3.75 in. x 6.00 in. Prices and sales of new and existing homes in the U.S., 1980-2009. -- category = F