NOTE: Rail productivity data are
only available through 1999. Source data are indexes with base years of 1997
(air), 1996 (business), and 1987 (rail). The Bureau of Transportation
Statistics reindexed these data so that 1991 is the
base year for all.
SOURCES: U.S.
Department of Labor, Bureau of Labor Statistics, available at
http://www.bls.gov/, as of October 2003. Business sector—“Most
Requested Statistics.” Rail—“Industry Multifactor
Productivity Data Table by Industry, 1987–1999.” Air—“Multifactor Productivity Data for Air Transportation.”
