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(Millions of crossties)
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1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 Replaced crossties 14.1 12.6 13.5 12...(Tons per carload)
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1991 2001 Farm products 90 94 Coal 99 110 Nonmetallic minerals 92 96 Food and...Number
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Structurally deficient Functionally obsolete Total Interstate 1,760 5,675 27,875 Other freeways or expressways 985 3,368 16,112 Other principal...(Quadrillion BTU)
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1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 Residential 16.9 17.4 17.3 18.1 18.1 18.5 19.5 18.9 18....(Current dollars)
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1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 Bus 0.14 0.15 0.15 0.15 0.17 0.17 0.18 0.18 0.20 0.20...Index: 1991 = 1.00
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1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 CO 1.00 0.95 0.90 0.86 0.81 0.76 0.74 0.71 0....(Chained 1996 dollars)
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Year Revenue per RPM 1993 0.15 1994 0.14 1995 0.14 1996 0.15 1997 0.15 1998 0.15 1999 0....(Percent)
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CO NOx VOCs PM-10 Highway gasoline 92.9 41.7 74.7 27.1 Highway diesel 1.4 37.5 3.6 37.8 Aircraft 5.1 0.8 0.3 0....(Number of flights)
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1996 1997 1998 1999 2000 2001 2002 On-time flights 3,989,281 4,218,165 4,156,980 4,207,293 4,130,185 4,619,234 4...(Billions of chained 1996 dollars)
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2000 Highway 79,202 Transit 11,436 Air 19,552 Water 3,320 Pipeline...