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3-5/8% 30-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due April 15, 2028

Ref CPI and Index Ratios for May 2011

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            TIPS of April 2028
    CUSIP NUMBER:                           912810FD5
    DATED DATE:                             April 15, 1998
    ORIGINAL ISSUE DATE:                    April 15, 1998
    ADDITIONAL ISSUE DATE:                  July 15, 1998
    MATURITY DATE:                          April 15, 2028
    Ref CPI on DATED DATE:                  161.74000
    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       1.36830
    May            2       2011    221.37861       1.36873
    May            3       2011    221.44823       1.36916
    May            4       2011    221.51784       1.36959
    May            5       2011    221.58745       1.37002
    May            6       2011    221.65706       1.37045
    May            7       2011    221.72668       1.37088
    May            8       2011    221.79629       1.37131
    May            9       2011    221.86590       1.37174
    May            10      2011    221.93552       1.37217
    May            11      2011    222.00513       1.37260
    May            12      2011    222.07474       1.37304
    May            13      2011    222.14435       1.37347
    May            14      2011    222.21397       1.37390
    May            15      2011    222.28358       1.37433
    May            16      2011    222.35319       1.37476
    May            17      2011    222.42281       1.37519
    May            18      2011    222.49242       1.37562
    May            19      2011    222.56203       1.37605
    May            20      2011    222.63165       1.37648
    May            21      2011    222.70126       1.37691
    May            22      2011    222.77087       1.37734
    May            23      2011    222.84048       1.37777
    May            24      2011    222.91010       1.37820
    May            25      2011    222.97971       1.37863
    May            26      2011    223.04932       1.37906
    May            27      2011    223.11894       1.37949
    May            28      2011    223.18855       1.37992
    May            29      2011    223.25816       1.38035
    May            30      2011    223.32777       1.38078
    May            31      2011    223.39739       1.38121