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

Ref CPI and Index Ratios for October 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:                     October 2011
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) June 2011                   225.722
    CPI-U (NSA) July 2011                   225.922
    CPI-U (NSA) August 2011                 226.545

    Month   Calendar Day   Year    Ref CPI      Index Ratio

    October        1       2011    225.92200       1.04250
    October        2       2011    225.94210       1.04259
    October        3       2011    225.96219       1.04268
    October        4       2011    225.98229       1.04278
    October        5       2011    226.00239       1.04287
    October        6       2011    226.02248       1.04296
    October        7       2011    226.04258       1.04305
    October        8       2011    226.06268       1.04315
    October        9       2011    226.08277       1.04324
    October        10      2011    226.10287       1.04333
    October        11      2011    226.12297       1.04343
    October        12      2011    226.14306       1.04352
    October        13      2011    226.16316       1.04361
    October        14      2011    226.18326       1.04370
    October        15      2011    226.20335       1.04380
    October        16      2011    226.22345       1.04389
    October        17      2011    226.24355       1.04398
    October        18      2011    226.26365       1.04407
    October        19      2011    226.28374       1.04417
    October        20      2011    226.30384       1.04426
    October        21      2011    226.32394       1.04435
    October        22      2011    226.34403       1.04445
    October        23      2011    226.36413       1.04454
    October        24      2011    226.38423       1.04463
    October        25      2011    226.40432       1.04472
    October        26      2011    226.42442       1.04482
    October        27      2011    226.44452       1.04491
    October        28      2011    226.46461       1.04500
    October        29      2011    226.48471       1.04509
    October        30      2011    226.50481       1.04519
    October        31      2011    226.52490       1.04528