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2% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2016

Ref CPI and Index Ratios for April 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series A-2016
    CUSIP NUMBER:                           912828ET3
    DATED DATE:                             January 15, 2006
    ORIGINAL ISSUE DATE:                    January 17, 2006
    ADDITIONAL ISSUE DATE:                  April 17, 2006
    MATURITY DATE:                          January 15, 2016
    Ref CPI on DATED DATE:                  198.47742
    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       1.06350
    April        2          2008    211.10043       1.06360
    April        3          2008    211.12087       1.06370
    April        4          2008    211.14130       1.06381
    April        5          2008    211.16173       1.06391
    April        6          2008    211.18217       1.06401
    April        7          2008    211.20260       1.06411
    April        8          2008    211.22303       1.06422
    April        9          2008    211.24347       1.06432
    April        10         2008    211.26390       1.06442
    April        11         2008    211.28433       1.06453
    April        12         2008    211.30477       1.06463
    April        13         2008    211.32520       1.06473
    April        14         2008    211.34563       1.06483
    April        15         2008    211.36607       1.06494
    April        16         2008    211.38650       1.06504
    April        17         2008    211.40693       1.06514
    April        18         2008    211.42737       1.06525
    April        19         2008    211.44780       1.06535
    April        20         2008    211.46823       1.06545
    April        21         2008    211.48867       1.06556
    April        22         2008    211.50910       1.06566
    April        23         2008    211.52953       1.06576
    April        24         2008    211.54997       1.06586
    April        25         2008    211.57040       1.06597
    April        26         2008    211.59083       1.06607
    April        27         2008    211.61127       1.06617
    April        28         2008    211.63170       1.06628
    April        29         2008    211.65213       1.06638
    April        30         2008    211.67257       1.06648