NOTE: Goods production refers to the agriculture, mining, and manufacturing
sectors based on the 1987 Standard Industrial Classification
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics,
based on data fromn U.S. Department of Commerce, Bureau of Economic Analysis,
National Income and Products Account (NIPA) basis, revisions through August
2001, available at http://www.bea.doc.gov/bea/dn1.htm, as of August 2002