Billions of Current Dollars Category 1998 2008 2018 2028 1. Gross domestic product $ $14,712 8 $20,494.1 $30,493.1 2. Personal consumption expenditures 5,877.2 9,976.3 13,948.5 3. Gross private domestic investment 1,736.7 3,650.1 5,822.0 Government expenditures 1,611.6 2,982.0 3,520.8 4,741.3 4. Exports 953.0 1,837.1 3,891.0 Imports 1,115.7 2,560.1 3,156.7 4,711.5