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3-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2008

Ref CPI and Index Ratios for September 2007

    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 2007
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) May 2007                    207.949
    CPI-U (NSA) June 2007                   208.352
    CPI-U (NSA) July 2007                   208.299

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    September       1       2007    208.35200       1.28967
    September       2       2007    208.35023       1.28966
    September       3       2007    208.34847       1.28965
    September       4       2007    208.34670       1.28963
    September       5       2007    208.34493       1.28962
    September       6       2007    208.34317       1.28961
    September       7       2007    208.34140       1.28960
    September       8       2007    208.33963       1.28959
    September       9       2007    208.33787       1.28958
    September       10      2007    208.33610       1.28957
    September       11      2007    208.33433       1.28956
    September       12      2007    208.33257       1.28955
    September       13      2007    208.33080       1.28954
    September       14      2007    208.32903       1.28953
    September       15      2007    208.32727       1.28951
    September       16      2007    208.32550       1.28950
    September       17      2007    208.32373       1.28949
    September       18      2007    208.32197       1.28948
    September       19      2007    208.32020       1.28947
    September       20      2007    208.31843       1.28946
    September       21      2007    208.31667       1.28945
    September       22      2007    208.31490       1.28944
    September       23      2007    208.31313       1.28943
    September       24      2007    208.31137       1.28942
    September       25      2007    208.30960       1.28940
    September       26      2007    208.30783       1.28939
    September       27      2007    208.30607       1.28938
    September       28      2007    208.30430       1.28937
    September       29      2007    208.30253       1.28936
    September       30      2007    208.30077       1.28935