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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 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:                     July 2007
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) March 2007                  205.352
    CPI-U (NSA) April 2007                  206.686
    CPI-U (NSA) May 2007                    207.949

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    July            1       2007    206.68600       1.27936
    July            2       2007    206.72674       1.27961
    July            3       2007    206.76748       1.27986
    July            4       2007    206.80823       1.28011
    July            5       2007    206.84897       1.28036
    July            6       2007    206.88971       1.28062
    July            7       2007    206.93045       1.28087
    July            8       2007    206.97119       1.28112
    July            9       2007    207.01194       1.28137
    July            10      2007    207.05268       1.28162
    July            11      2007    207.09342       1.28188
    July            12      2007    207.13416       1.28213
    July            13      2007    207.17490       1.28238
    July            14      2007    207.21565       1.28263
    July            15      2007    207.25639       1.28289
    July            16      2007    207.29713       1.28314
    July            17      2007    207.33787       1.28339
    July            18      2007    207.37861       1.28364
    July            19      2007    207.41935       1.28389
    July            20      2007    207.46010       1.28415
    July            21      2007    207.50084       1.28440
    July            22      2007    207.54158       1.28465
    July            23      2007    207.58232       1.28490
    July            24      2007    207.62306       1.28516
    July            25      2007    207.66381       1.28541
    July            26      2007    207.70455       1.28566
    July            27      2007    207.74529       1.28591
    July            28      2007    207.78603       1.28616
    July            29      2007    207.82677       1.28642
    July            30      2007    207.86752       1.28667
    July            31      2007    207.90826       1.28692