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3-1/2% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2011

Ref CPI and Index Ratios for April 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series A-2011
    CUSIP NUMBER:                           9128276R8
    DATED DATE:                             January 15, 2001
    ORIGINAL ISSUE DATE:                    January 16, 2001
    ADDITIONAL ISSUE DATE:                  July 16, 2001
    MATURITY DATE:                          January 15, 2011
    Ref CPI on DATED DATE:                  174.04516
    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       1.21279
    April        2          2008    211.10043       1.21291
    April        3          2008    211.12087       1.21302
    April        4          2008    211.14130       1.21314
    April        5          2008    211.16173       1.21326
    April        6          2008    211.18217       1.21338
    April        7          2008    211.20260       1.21349
    April        8          2008    211.22303       1.21361
    April        9          2008    211.24347       1.21373
    April        10         2008    211.26390       1.21385
    April        11         2008    211.28433       1.21396
    April        12         2008    211.30477       1.21408
    April        13         2008    211.32520       1.21420
    April        14         2008    211.34563       1.21431
    April        15         2008    211.36607       1.21443
    April        16         2008    211.38650       1.21455
    April        17         2008    211.40693       1.21467
    April        18         2008    211.42737       1.21478
    April        19         2008    211.44780       1.21490
    April        20         2008    211.46823       1.21502
    April        21         2008    211.48867       1.21514
    April        22         2008    211.50910       1.21525
    April        23         2008    211.52953       1.21537
    April        24         2008    211.54997       1.21549
    April        25         2008    211.57040       1.21561
    April        26         2008    211.59083       1.21572
    April        27         2008    211.61127       1.21584
    April        28         2008    211.63170       1.21596
    April        29         2008    211.65213       1.21608
    April        30         2008    211.67257       1.21619