(Index: 1975 = 1.0)
Excel | CSV | Graphic Version
| Year | GDP | Ton-miles | Population | Ton-miles per $ GDP |
|---|---|---|---|---|
| 1975 | 1.00 | 1.00 | 1.00 | 1.00 |
| 1980 | 1.20 | 1.31 | 1.05 | 1.09 |
| 1985 | 1.40 | 1.29 | 1.10 | 0.92 |
| 1990 | 1.64 | 1.40 | 1.16 | 0.85 |
| 1991 | 1.63 | 1.41 | 1.17 | 0.87 |
| 1992 | 1.68 | 1.46 | 1.18 | 0.87 |
| 1993 | 1.73 | 1.47 | 1.19 | 0.85 |
| 1994 | 1.80 | 1.54 | 1.21 | 0.86 |
| 1995 | 1.85 | 1.60 | 1.22 | 0.86 |
| 1996 | 1.91 | 1.63 | 1.23 | 0.85 |
| 1997 | 2.00 | 1.64 | 1.24 | 0.82 |
| 1998 | 2.08 | 1.62 | 1.25 | 0.78 |
| 1999 | 2.17 | 1.67 | 1.26 | 0.77 |
KEY: GDP = Gross Domestic Product.
SOURCE: GDP data-U.S. Department of Commerce, Bureau of Economic Analysis, available at www.bea.doc.gov/bea/dn/gdplev.htm, as of Apr. 20, 2001. Ton-miles data-U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 2001 (Washington, DC: 2002). Population data-U.S. Department of Commerce, U.S. Census Bureau, available at www.census.gov/population/estimates/nation/popclockest.txt, as of Apr. 20, 2001.