Billions of chained 2000 dollars, except as noted |Share of GDP 
(percent)||2.9||2.9||3.0||3.1||3.1||3.2||3.2||3.2||3.1||3.2||3.0
| KEY: GDP = Gross Domestic Product. NOTES: For-hire
transportation includes railroad transportation, local and
interurban passenger transit, trucking and warehousing, water
transportation, transportation by air, pipelines (except natural
gas), and transportation services. Transportation services cover
establishments furnishing services incidental to transportation
(e.g., forwarding and packing services and the arrangement of
passenger and freight transportation). Current dollar amounts
(see table 13-4b) were converted to chained 2000 dollars by the
Bureau of Transportation Statistics to eliminate the effects of
inflation over time. SOURCE: U.S. Department of Transportation,
Bureau of Transportation Statistics, calculations based on data
from U.S. Department of Commerce, Bureau of Economic Analysis,
"Gross Domestic Product by Industry," available at
http://www.bea.gov/bea/dn2/gpo.htm