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

Ref CPI and Index Ratios for July 2006

    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:                  July 2006
    NUMBER OF DAYS IN MONTH:             31

    CPI-U (NSA) March 2006               199.8
    CPI-U (NSA) April 2006               201.5
    CPI-U (NSA) May 2006                 202.5

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    July            1       2006    201.50000       1.24725
    July            2       2006    201.53226       1.24745
    July            3       2006    201.56452       1.24765
    July            4       2006    201.59677       1.24785
    July            5       2006    201.62903       1.24805
    July            6       2006    201.66129       1.24825
    July            7       2006    201.69355       1.24845
    July            8       2006    201.72581       1.24865
    July            9       2006    201.75806       1.24885
    July            10      2006    201.79032       1.24905
    July            11      2006    201.82258       1.24925
    July            12      2006    201.85484       1.24945
    July            13      2006    201.88710       1.24965
    July            14      2006    201.91935       1.24985
    July            15      2006    201.95161       1.25005
    July            16      2006    201.98387       1.25025
    July            17      2006    202.01613       1.25045
    July            18      2006    202.04839       1.25065
    July            19      2006    202.08065       1.25085
    July            20      2006    202.11290       1.25105
    July            21      2006    202.14516       1.25125
    July            22      2006    202.17742       1.25145
    July            23      2006    202.20968       1.25165
    July            24      2006    202.24194       1.25185
    July            25      2006    202.27419       1.25205
    July            26      2006    202.30645       1.25225
    July            27      2006    202.33871       1.25245
    July            28      2006    202.37097       1.25265
    July            29      2006    202.40323       1.25285
    July            30      2006    202.43548       1.25304
    July            31      2006    202.46774       1.25324