Bureau of Transportation Statistics (BTS)
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Table 3-28 Cash Balances of the Transportation-related Federal Trust Funds, Fiscal Year ($ millions)

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  FY 1980 FY 1985 FY 1990 FY 1991 FY 1992 FY 1993 FY 1994 FY 1995 FY 1996 FY 1997 FY 1998
Airport/Airway Trust Fund                      
$ current 5,442 7,426 14,355 15,263 15,204 12,850 12,386 11,365 7,692 6,358 9,411
$ constant 1996R 9,473 9,814 17,133 17,508 16,926 13,940 13,106 11,691 7,692 6,274 9,188
Highway Trust Fund                      
Highway account                      
$ current 10,999 10,361 9,629 10,246 11,300 11,523 7,927 9,421 11,658 12,575 8,519
$ constant 1996R 19,145 13,692 11,493 11,753 12,580 12,500 8,388 9,691 11,658 12,410 8,318
Transit account                      
$ current N 2,524 7,155 9,250 9,798 10,617 9,945 9,579 9,525 9,857 10,051
$ constant 1996R N 3,336 8,540 10,610 10,908 11,517 10,523 9,854 9,525 9,727 9,813
Harbor Maintenance Trust Fund                      
$ current N N 30 74 121 305 451 621 865 1,106 1,246
$ constant 1996R N N 36 85 135 331 477 639 865 1,091 1,217
Inland Waterway Trust Fund                      
$ current N 172 281 217 186 180 214 238 275 300 327
$ constant 1996R N 227 335 249 207 195 226 245 275 296 319
Oil Spill Liability Trust Fund                      
$ current N N 345 647 866 1,024 993 1,121 1,124 1,110 1,083
$ constant 1996R N N 412 742 964 1,111 1,051 1,153 1,124 1,095 1,057
Total all funds                      
$ current 16,441 20,483 31,795 35,697 37,475 36,499 31,916 32,345 31,139 31,306 30,637
$ constant 1996R 28,618 27,069 37,949 40,947 41,720 39,594 33,771 33,273 31,139 30,894 29,913

KEY: FY = fiscal year; N = data do not exist; R = revised.

SOURCES:
1980-94: U.S. Department of Transportation, Bureau of Transportation Statistics, Transportation Receipts and Outlays in the Federal Budget,  Fiscal Years 1977-94 (Washington, DC: April 1997), table 1-3.
1995-97: U.S. Executive Office of the President, Office of Management and Budget, Budget of the United States Government, Appendix (Washington, DC: Annual issues). Constant dollar deflator: U.S. Department of Commerce, Bureau of Economic Analysis, Survey of Current Business (Washington, DC: June 2000),  table 7-11, "Chain Type Price Indexes-Federal."