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2-1/8% 30-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due February 15, 2040

Ref CPI and Index Ratios for May 2011

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            TIPS of February 2040
    CUSIP NUMBER:                           912810QF8
    DATED DATE:                             February 15, 2010
    ORIGINAL ISSUE DATE:                    February 26, 2010
    ADDITIONAL ISSUE DATE:                  August 31, 2010
    MATURITY DATE:                          February 15, 2040
    Ref CPI on DATED DATE:                  216.13950
    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       1.02392
    May            2       2011    221.37861       1.02424
    May            3       2011    221.44823       1.02456
    May            4       2011    221.51784       1.02488
    May            5       2011    221.58745       1.02521
    May            6       2011    221.65706       1.02553
    May            7       2011    221.72668       1.02585
    May            8       2011    221.79629       1.02617
    May            9       2011    221.86590       1.02649
    May            10      2011    221.93552       1.02682
    May            11      2011    222.00513       1.02714
    May            12      2011    222.07474       1.02746
    May            13      2011    222.14435       1.02778
    May            14      2011    222.21397       1.02810
    May            15      2011    222.28358       1.02843
    May            16      2011    222.35319       1.02875
    May            17      2011    222.42281       1.02907
    May            18      2011    222.49242       1.02939
    May            19      2011    222.56203       1.02971
    May            20      2011    222.63165       1.03004
    May            21      2011    222.70126       1.03036
    May            22      2011    222.77087       1.03068
    May            23      2011    222.84048       1.03100
    May            24      2011    222.91010       1.03133
    May            25      2011    222.97971       1.03165
    May            26      2011    223.04932       1.03197
    May            27      2011    223.11894       1.03229
    May            28      2011    223.18855       1.03261
    May            29      2011    223.25816       1.03294
    May            30      2011    223.32777       1.03326
    May            31      2011    223.39739       1.03358