"Figure 2
Total Transportation Services in For-Hire Industries vs. Household 
Production: 1991–2000",,
($ billion),,
,For-hire transportation industries,HPTS
1991,356,681
1992,373,715
1993,393,756
1994,419,807
1995,444,848
1996,472,905
1997,500,945
1998,530,981
1999,563,"1,059"
2000,604,"1,152"