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3-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for September 2005

Contact: Office of Financing      202-504-3550
DESCRIPTION:                            Series A-2008
CUSIP NUMBER:                           9128273T7
DATED DATE:                             January 15, 1998
ORIGINAL ISSUE DATE:                    January 15, 1998
ADDITIONAL ISSUE DATE:                  October 15, 1998
MATURITY DATE:                          January 15, 2008
Ref CPI on DATED DATE:                  161.55484
TABLE FOR MONTH OF:                     September 2005
NUMBER OF DAYS IN MONTH:                30

CPI-U (NSA) May 2005                    194.4
CPI-U (NSA) June 2005                   194.5
CPI-U (NSA) July 2005                   195.4

Month   Calendar Day    Year    Ref CPI      Index Ratio

September      1       2005    194.50000       1.20393
September      2       2005    194.53000       1.20411
September      3       2005    194.56000       1.20430
September      4       2005    194.59000       1.20448
September      5       2005    194.62000       1.20467
September      6       2005    194.65000       1.20485
September      7       2005    194.68000       1.20504
September      8       2005    194.71000       1.20523
September      9       2005    194.74000       1.20541
September      10      2005    194.77000       1.20560
September      11      2005    194.80000       1.20578
September      12      2005    194.83000       1.20597
September      13      2005    194.86000       1.20615
September      14      2005    194.89000       1.20634
September      15      2005    194.92000       1.20653
September      16      2005    194.95000       1.20671
September      17      2005    194.98000       1.20690
September      18      2005    195.01000       1.20708
September      19      2005    195.04000       1.20727
September      20      2005    195.07000       1.20745
September      21      2005    195.10000       1.20764
September      22      2005    195.13000       1.20783
September      23      2005    195.16000       1.20801
September      24      2005    195.19000       1.20820
September      25      2005    195.22000       1.20838
September      26      2005    195.25000       1.20857
September      27      2005    195.28000       1.20875
September      28      2005    195.31000       1.20894
September      29      2005    195.34000       1.20913
September      30      2005    195.37000       1.20931