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SOURCES: U.S. Department of Energy, Energy Information Administration, Annual Energy Review, tables 5.13a - 5.13d, available at http://www.eia.doe.gov/emeu/aer/contents.html as of July 2008 as reported in U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, table 4-3, available at http://www.bts.gov/publications/national_transportation_statistics/ as of July 2008.