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

Ref CPI and Index Ratios for April 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:                     April 2008
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) December 2007               210.036
    CPI-U (NSA) January 2008                211.080
    CPI-U (NSA) February 2008               211.693

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    April        1          2008    211.08000       1.08519
    April        2          2008    211.10043       1.08530
    April        3          2008    211.12087       1.08540
    April        4          2008    211.14130       1.08551
    April        5          2008    211.16173       1.08561
    April        6          2008    211.18217       1.08572
    April        7          2008    211.20260       1.08582
    April        8          2008    211.22303       1.08593
    April        9          2008    211.24347       1.08603
    April        10         2008    211.26390       1.08614
    April        11         2008    211.28433       1.08624
    April        12         2008    211.30477       1.08635
    April        13         2008    211.32520       1.08645
    April        14         2008    211.34563       1.08656
    April        15         2008    211.36607       1.08666
    April        16         2008    211.38650       1.08677
    April        17         2008    211.40693       1.08687
    April        18         2008    211.42737       1.08698
    April        19         2008    211.44780       1.08708
    April        20         2008    211.46823       1.08719
    April        21         2008    211.48867       1.08729
    April        22         2008    211.50910       1.08740
    April        23         2008    211.52953       1.08750
    April        24         2008    211.54997       1.08761
    April        25         2008    211.57040       1.08771
    April        26         2008    211.59083       1.08782
    April        27         2008    211.61127       1.08792
    April        28         2008    211.63170       1.08803
    April        29         2008    211.65213       1.08813
    April        30         2008    211.67257       1.08824