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1-1/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2021

Ref CPI and Index Ratios for May 2012

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            A-2021
    CUSIP NUMBER:                           912828PP9
    DATED DATE:                             January 15, 2011
    ORIGINAL ISSUE DATE:                    January 31, 2011
    ADDITIONAL ISSUE DATE:                  March 31, 2011
                                            May 31, 2011
    MATURITY DATE:                          January 15, 2021
    Ref CPI on DATED DATE:                  218.75255
    TABLE FOR MONTH OF:                     May 2012
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) January 2012                226.665
    CPI-U (NSA) February 2012               227.663
    CPI-U (NSA) March 2012                  229.392

    Month   Calendar Day   Year    Ref CPI      Index Ratio

    May            1       2012    227.66300       1.04073
    May            2       2012    227.71877       1.04099
    May            3       2012    227.77455       1.04124
    May            4       2012    227.83032       1.04150
    May            5       2012    227.88610       1.04175
    May            6       2012    227.94187       1.04201
    May            7       2012    227.99765       1.04226
    May            8       2012    228.05342       1.04252
    May            9       2012    228.10919       1.04277
    May            10      2012    228.16497       1.04303
    May            11      2012    228.22074       1.04328
    May            12      2012    228.27652       1.04354
    May            13      2012    228.33229       1.04379
    May            14      2012    228.38806       1.04405
    May            15      2012    228.44384       1.04430
    May            16      2012    228.49961       1.04456
    May            17      2012    228.55539       1.04481
    May            18      2012    228.61116       1.04507
    May            19      2012    228.66694       1.04532
    May            20      2012    228.72271       1.04558
    May            21      2012    228.77848       1.04583
    May            22      2012    228.83426       1.04609
    May            23      2012    228.89003       1.04634
    May            24      2012    228.94581       1.04660
    May            25      2012    229.00158       1.04685
    May            26      2012    229.05735       1.04711
    May            27      2012    229.11313       1.04736
    May            28      2012    229.16890       1.04762
    May            29      2012    229.22468       1.04787
    May            30      2012    229.28045       1.04813
    May            31      2012    229.33623       1.04838