Manufacturing made up 11% of gross domestic product in the second quarter, the smallest share in data going back to 1947 and down from 11.1% in the prior period, a Commerce Department report showed Tuesday. Figures before 2005 were for full years only. The latest number compares with 13.4% for real estate, 12.8% for professional and business services and 12.3% for governments, according to the figures on GDP by industry.