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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 2011

    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 2011
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) January 2011                220.223
    CPI-U (NSA) February 2011               221.309
    CPI-U (NSA) March 2011                  223.467

    Month   Calendar Day   Year    Ref CPI      Index Ratio

    May            1       2011    221.30900       1.01169
    May            2       2011    221.37861       1.01200
    May            3       2011    221.44823       1.01232
    May            4       2011    221.51784       1.01264
    May            5       2011    221.58745       1.01296
    May            6       2011    221.65706       1.01328
    May            7       2011    221.72668       1.01360
    May            8       2011    221.79629       1.01391
    May            9       2011    221.86590       1.01423
    May            10      2011    221.93552       1.01455
    May            11      2011    222.00513       1.01487
    May            12      2011    222.07474       1.01519
    May            13      2011    222.14435       1.01551
    May            14      2011    222.21397       1.01582
    May            15      2011    222.28358       1.01614
    May            16      2011    222.35319       1.01646
    May            17      2011    222.42281       1.01678
    May            18      2011    222.49242       1.01710
    May            19      2011    222.56203       1.01741
    May            20      2011    222.63165       1.01773
    May            21      2011    222.70126       1.01805
    May            22      2011    222.77087       1.01837
    May            23      2011    222.84048       1.01869
    May            24      2011    222.91010       1.01901
    May            25      2011    222.97971       1.01932
    May            26      2011    223.04932       1.01964
    May            27      2011    223.11894       1.01996
    May            28      2011    223.18855       1.02028
    May            29      2011    223.25816       1.02060
    May            30      2011    223.32777       1.02092
    May            31      2011    223.39739       1.02123