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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2015

Ref CPI and Index Ratios for February 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series D-2015
    CUSIP NUMBER:                           912828EA4
    DATED DATE:                             July 15, 2005
    ORIGINAL ISSUE DATE:                    July 15, 2005
    ADDITIONAL ISSUE DATE:                  October 17, 2005
    MATURITY DATE:                          July 15, 2015
    Ref CPI on DATED DATE:                  194.50968
    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       1.08055
    February        2        2008    210.17214       1.08052
    February        3        2008    210.16728       1.08050
    February        4        2008    210.16241       1.08047
    February        5        2008    210.15755       1.08045
    February        6        2008    210.15269       1.08042
    February        7        2008    210.14783       1.08040
    February        8        2008    210.14297       1.08037
    February        9        2008    210.13810       1.08035
    February        10       2008    210.13324       1.08032
    February        11       2008    210.12838       1.08030
    February        12       2008    210.12352       1.08027
    February        13       2008    210.11866       1.08025
    February        14       2008    210.11379       1.08022
    February        15       2008    210.10893       1.08020
    February        16       2008    210.10407       1.08017
    February        17       2008    210.09921       1.08015
    February        18       2008    210.09434       1.08012
    February        19       2008    210.08948       1.08010
    February        20       2008    210.08462       1.08007
    February        21       2008    210.07976       1.08005
    February        22       2008    210.07490       1.08002
    February        23       2008    210.07003       1.08000
    February        24       2008    210.06517       1.07997
    February        25       2008    210.06031       1.07995
    February        26       2008    210.05545       1.07992
    February        27       2008    210.05059       1.07990
    February        28       2008    210.04572       1.07987
    February        29       2008    210.04086       1.07985