 And home builders who bucked the worst of last year's housing slump may be seeing their luck run out. After showing signs of strengthening earlier this year, sales of new U.S. homes fell in April and May from a year earlier by 7.7% and 16.5% respectively. Now, last month's sales skidded to a seasonally adjusted annual rate of 619,000 units, the slowest pace since November, according to the U.S. Census Bureau.