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^aIncludes transportation-related goods (e.g., vehicles and fuel) and services (e.g., auto insurance), private investment in transportation-related structures and equipment, net exports related to transportation, and change in motor vehicles inventory. ^bIncludes all other categories such as entertainment, personal care products and services, and payments to pension plans.

Source: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, calculated based on data from U.S. Department of Commerce, Bureau of Economic Analysis, National Income and Product Account Tables, available at http://www.bea.gov/national/nipaweb/Index.asp as of September 2012 as reported in U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, table 3-9, available at https://www.bts.dot.gov/archive/publications/national_transportation_statistics/index accessed September 2012.