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2-3/8% 5-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due April 15, 2011

Ref CPI and Index Ratios for April 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series G-2011
    CUSIP NUMBER:                           912828FB1
    DATED DATE:                             April 15, 2006
    ORIGINAL ISSUE DATE:                    April 28, 2006
    ADDITIONAL ISSUE DATE:                  October 31, 2006
    MATURITY DATE:                          April 15, 2011
    Ref CPI on DATED DATE:                  198.48667
    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       1.06345
    April        2          2008    211.10043       1.06355
    April        3          2008    211.12087       1.06365
    April        4          2008    211.14130       1.06376
    April        5          2008    211.16173       1.06386
    April        6          2008    211.18217       1.06396
    April        7          2008    211.20260       1.06406
    April        8          2008    211.22303       1.06417
    April        9          2008    211.24347       1.06427
    April        10         2008    211.26390       1.06437
    April        11         2008    211.28433       1.06448
    April        12         2008    211.30477       1.06458
    April        13         2008    211.32520       1.06468
    April        14         2008    211.34563       1.06479
    April        15         2008    211.36607       1.06489
    April        16         2008    211.38650       1.06499
    April        17         2008    211.40693       1.06509
    April        18         2008    211.42737       1.06520
    April        19         2008    211.44780       1.06530
    April        20         2008    211.46823       1.06540
    April        21         2008    211.48867       1.06551
    April        22         2008    211.50910       1.06561
    April        23         2008    211.52953       1.06571
    April        24         2008    211.54997       1.06581
    April        25         2008    211.57040       1.06592
    April        26         2008    211.59083       1.06602
    April        27         2008    211.61127       1.06612
    April        28         2008    211.63170       1.06623
    April        29         2008    211.65213       1.06633
    April        30         2008    211.67257       1.06643