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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2015

Ref CPI and Index Ratios for May 2011

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            D-2015
    CUSIP NUMBER:                           912828EA4
    DATED DATE:                             July 15, 2005
    ORIGINAL ISSUE DATE:                    July 15, 2005
    ADDITIONAL ISSUE DATE:                  October 17, 2005
    MATURITY DATE:                          July 15, 2015
    Ref CPI on DATED DATE:                  194.50968
    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       1.13778
    May            2       2011    221.37861       1.13814
    May            3       2011    221.44823       1.13849
    May            4       2011    221.51784       1.13885
    May            5       2011    221.58745       1.13921
    May            6       2011    221.65706       1.13957
    May            7       2011    221.72668       1.13993
    May            8       2011    221.79629       1.14028
    May            9       2011    221.86590       1.14064
    May            10      2011    221.93552       1.14100
    May            11      2011    222.00513       1.14136
    May            12      2011    222.07474       1.14172
    May            13      2011    222.14435       1.14207
    May            14      2011    222.21397       1.14243
    May            15      2011    222.28358       1.14279
    May            16      2011    222.35319       1.14315
    May            17      2011    222.42281       1.14351
    May            18      2011    222.49242       1.14386
    May            19      2011    222.56203       1.14422
    May            20      2011    222.63165       1.14458
    May            21      2011    222.70126       1.14494
    May            22      2011    222.77087       1.14529
    May            23      2011    222.84048       1.14565
    May            24      2011    222.91010       1.14601
    May            25      2011    222.97971       1.14637
    May            26      2011    223.04932       1.14673
    May            27      2011    223.11894       1.14708
    May            28      2011    223.18855       1.14744
    May            29      2011    223.25816       1.14780
    May            30      2011    223.32777       1.14816
    May            31      2011    223.39739       1.14852