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0-7/8% 5-1/2-YEAR TREASURY INFLATION-PROTECTED SECURITIES Due April 15, 2010

Ref CPI and Index Ratios for February 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series D-2010
    CUSIP NUMBER:                           912828CZ1
    DATED DATE:                             October 15, 2004
    ORIGINAL ISSUE DATE:                    October 29, 2004
    ADDITIONAL ISSUE DATE:                  April 29, 2005
                                            October 28, 2005
    MATURITY DATE:                          April 15, 2010
    Ref CPI on DATED DATE:                  189.44516
    TABLE FOR MONTH OF:                     February 2008
    NUMBER OF DAYS IN MONTH:                29

    CPI-U (NSA) October 2007                208.936
    CPI-U (NSA) November 2007               210.177
    CPI-U (NSA) December 2007               210.036

    Month    Calendar Day    Year    Ref CPI       Index Ratio

    February        1        2008    210.17700       1.10943
    February        2        2008    210.17214       1.10941
    February        3        2008    210.16728       1.10938
    February        4        2008    210.16241       1.10936
    February        5        2008    210.15755       1.10933
    February        6        2008    210.15269       1.10931
    February        7        2008    210.14783       1.10928
    February        8        2008    210.14297       1.10925
    February        9        2008    210.13810       1.10923
    February        10       2008    210.13324       1.10920
    February        11       2008    210.12838       1.10918
    February        12       2008    210.12352       1.10915
    February        13       2008    210.11866       1.10913
    February        14       2008    210.11379       1.10910
    February        15       2008    210.10893       1.10908
    February        16       2008    210.10407       1.10905
    February        17       2008    210.09921       1.10902
    February        18       2008    210.09434       1.10900
    February        19       2008    210.08948       1.10897
    February        20       2008    210.08462       1.10895
    February        21       2008    210.07976       1.10892
    February        22       2008    210.07490       1.10890
    February        23       2008    210.07003       1.10887
    February        24       2008    210.06517       1.10884
    February        25       2008    210.06031       1.10882
    February        26       2008    210.05545       1.10879
    February        27       2008    210.05059       1.10877
    February        28       2008    210.04572       1.10874
    February        29       2008    210.04086       1.10872