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0-1/2% 5-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due April 15, 2015

Ref CPI and Index Ratios for September 2011

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            K-2015
    CUSIP NUMBER:                           912828MY3
    DATED DATE:                             April 15, 2010
    ORIGINAL ISSUE DATE:                    April 30, 2010
    ADDITIONAL ISSUE DATE:                  October 29, 2010
    MATURITY DATE:                          April 15, 2015
    Ref CPI on DATED DATE:                  216.71220
    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       1.04157
    September      2       2011    225.72867       1.04161
    September      3       2011    225.73533       1.04164
    September      4       2011    225.74200       1.04167
    September      5       2011    225.74867       1.04170
    September      6       2011    225.75533       1.04173
    September      7       2011    225.76200       1.04176
    September      8       2011    225.76867       1.04179
    September      9       2011    225.77533       1.04182
    September      10      2011    225.78200       1.04185
    September      11      2011    225.78867       1.04188
    September      12      2011    225.79533       1.04191
    September      13      2011    225.80200       1.04194
    September      14      2011    225.80867       1.04197
    September      15      2011    225.81533       1.04201
    September      16      2011    225.82200       1.04204
    September      17      2011    225.82867       1.04207
    September      18      2011    225.83533       1.04210
    September      19      2011    225.84200       1.04213
    September      20      2011    225.84867       1.04216
    September      21      2011    225.85533       1.04219
    September      22      2011    225.86200       1.04222
    September      23      2011    225.86867       1.04225
    September      24      2011    225.87533       1.04228
    September      25      2011    225.88200       1.04231
    September      26      2011    225.88867       1.04234
    September      27      2011    225.89533       1.04237
    September      28      2011    225.90200       1.04241
    September      29      2011    225.90867       1.04244
    September      30      2011    225.91533       1.04247