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1-3/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2018

Ref CPI and Index Ratios for September 2011

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            D-2018
    CUSIP NUMBER:                           912828JE1
    DATED DATE:                             July 15, 2008
    ORIGINAL ISSUE DATE:                    July 15, 2008
    ADDITIONAL ISSUE DATE:                  October 15, 2008
    MATURITY DATE:                          July 15, 2018
    Ref CPI on DATED DATE:                  215.63997
    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       1.04675
    September      2       2011    225.72867       1.04678
    September      3       2011    225.73533       1.04682
    September      4       2011    225.74200       1.04685
    September      5       2011    225.74867       1.04688
    September      6       2011    225.75533       1.04691
    September      7       2011    225.76200       1.04694
    September      8       2011    225.76867       1.04697
    September      9       2011    225.77533       1.04700
    September      10      2011    225.78200       1.04703
    September      11      2011    225.78867       1.04706
    September      12      2011    225.79533       1.04709
    September      13      2011    225.80200       1.04712
    September      14      2011    225.80867       1.04716
    September      15      2011    225.81533       1.04719
    September      16      2011    225.82200       1.04722
    September      17      2011    225.82867       1.04725
    September      18      2011    225.83533       1.04728
    September      19      2011    225.84200       1.04731
    September      20      2011    225.84867       1.04734
    September      21      2011    225.85533       1.04737
    September      22      2011    225.86200       1.04740
    September      23      2011    225.86867       1.04743
    September      24      2011    225.87533       1.04747
    September      25      2011    225.88200       1.04750
    September      26      2011    225.88867       1.04753
    September      27      2011    225.89533       1.04756
    September      28      2011    225.90200       1.04759
    September      29      2011    225.90867       1.04762
    September      30      2011    225.91533       1.04765