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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 April 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:                     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       1.11420
    April        2          2008    211.10043       1.11431
    April        3          2008    211.12087       1.11442
    April        4          2008    211.14130       1.11452
    April        5          2008    211.16173       1.11463
    April        6          2008    211.18217       1.11474
    April        7          2008    211.20260       1.11485
    April        8          2008    211.22303       1.11496
    April        9          2008    211.24347       1.11506
    April        10         2008    211.26390       1.11517
    April        11         2008    211.28433       1.11528
    April        12         2008    211.30477       1.11539
    April        13         2008    211.32520       1.11550
    April        14         2008    211.34563       1.11560
    April        15         2008    211.36607       1.11571
    April        16         2008    211.38650       1.11582
    April        17         2008    211.40693       1.11593
    April        18         2008    211.42737       1.11603
    April        19         2008    211.44780       1.11614
    April        20         2008    211.46823       1.11625
    April        21         2008    211.48867       1.11636
    April        22         2008    211.50910       1.11647
    April        23         2008    211.52953       1.11657
    April        24         2008    211.54997       1.11668
    April        25         2008    211.57040       1.11679
    April        26         2008    211.59083       1.11690
    April        27         2008    211.61127       1.11701
    April        28         2008    211.63170       1.11711
    April        29         2008    211.65213       1.11722
    April        30         2008    211.67257       1.11733