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

Ref CPI and Index Ratios for February 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:                     February 2007
    NUMBER OF DAYS IN MONTH:                28

    CPI-U (NSA) October 2006                201.8
    CPI-U (NSA) November 2006               201.5
    CPI-U (NSA) December 2006               201.8

    Month    Calendar Day   Year    Ref CPI       Index Ratio

    February        1       2007    201.50000       1.24725
    February        2       2007    201.51071       1.24732
    February        3       2007    201.52143       1.24739
    February        4       2007    201.53214       1.24745
    February        5       2007    201.54286       1.24752
    February        6       2007    201.55357       1.24759
    February        7       2007    201.56429       1.24765
    February        8       2007    201.57500       1.24772
    February        9       2007    201.58571       1.24779
    February        10      2007    201.59643       1.24785
    February        11      2007    201.60714       1.24792
    February        12      2007    201.61786       1.24798
    February        13      2007    201.62857       1.24805
    February        14      2007    201.63929       1.24812
    February        15      2007    201.65000       1.24818
    February        16      2007    201.66071       1.24825
    February        17      2007    201.67143       1.24832
    February        18      2007    201.68214       1.24838
    February        19      2007    201.69286       1.24845
    February        20      2007    201.70357       1.24851
    February        21      2007    201.71429       1.24858
    February        22      2007    201.72500       1.24865
    February        23      2007    201.73571       1.24871
    February        24      2007    201.74643       1.24878
    February        25      2007    201.75714       1.24885
    February        26      2007    201.76786       1.24891
    February        27      2007    201.77857       1.24898
    February        28      2007    201.78929       1.24905