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

Ref CPI and Index Ratios for September 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:                     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       1.16047
    September      2       2011    225.72867       1.16050
    September      3       2011    225.73533       1.16054
    September      4       2011    225.74200       1.16057
    September      5       2011    225.74867       1.16060
    September      6       2011    225.75533       1.16064
    September      7       2011    225.76200       1.16067
    September      8       2011    225.76867       1.16071
    September      9       2011    225.77533       1.16074
    September      10      2011    225.78200       1.16078
    September      11      2011    225.78867       1.16081
    September      12      2011    225.79533       1.16084
    September      13      2011    225.80200       1.16088
    September      14      2011    225.80867       1.16091
    September      15      2011    225.81533       1.16095
    September      16      2011    225.82200       1.16098
    September      17      2011    225.82867       1.16102
    September      18      2011    225.83533       1.16105
    September      19      2011    225.84200       1.16108
    September      20      2011    225.84867       1.16112
    September      21      2011    225.85533       1.16115
    September      22      2011    225.86200       1.16119
    September      23      2011    225.86867       1.16122
    September      24      2011    225.87533       1.16125
    September      25      2011    225.88200       1.16129
    September      26      2011    225.88867       1.16132
    September      27      2011    225.89533       1.16136
    September      28      2011    225.90200       1.16139
    September      29      2011    225.90867       1.16143
    September      30      2011    225.91533       1.16146