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

Ref CPI and Index Ratios for September 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:                     September 2011
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) May 2011                    225.964
    CPI-U (NSA) June 2011                   225.722
    CPI-U (NSA) July 2011                   225.922

    Month   Calendar Day   Year    Ref CPI      Index Ratio

    September      1       2011    225.72200       1.39559
    September      2       2011    225.72867       1.39563
    September      3       2011    225.73533       1.39567
    September      4       2011    225.74200       1.39571
    September      5       2011    225.74867       1.39575
    September      6       2011    225.75533       1.39579
    September      7       2011    225.76200       1.39583
    September      8       2011    225.76867       1.39587
    September      9       2011    225.77533       1.39592
    September      10      2011    225.78200       1.39596
    September      11      2011    225.78867       1.39600
    September      12      2011    225.79533       1.39604
    September      13      2011    225.80200       1.39608
    September      14      2011    225.80867       1.39612
    September      15      2011    225.81533       1.39616
    September      16      2011    225.82200       1.39620
    September      17      2011    225.82867       1.39625
    September      18      2011    225.83533       1.39629
    September      19      2011    225.84200       1.39633
    September      20      2011    225.84867       1.39637
    September      21      2011    225.85533       1.39641
    September      22      2011    225.86200       1.39645
    September      23      2011    225.86867       1.39649
    September      24      2011    225.87533       1.39653
    September      25      2011    225.88200       1.39657
    September      26      2011    225.88867       1.39662
    September      27      2011    225.89533       1.39666
    September      28      2011    225.90200       1.39670
    September      29      2011    225.90867       1.39674
    September      30      2011    225.91533       1.39678