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

Ref CPI and Index Ratios for April 2012

    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:                     April 2012
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) December 2011               225.672
    CPI-U (NSA) January 2012                226.665
    CPI-U (NSA) February 2012               227.663

    Month   Calendar Day   Year    Ref CPI      Index Ratio

    April          1       2012    226.66500       1.16531
    April          2       2012    226.69827       1.16549
    April          3       2012    226.73153       1.16566
    April          4       2012    226.76480       1.16583
    April          5       2012    226.79807       1.16600
    April          6       2012    226.83133       1.16617
    April          7       2012    226.86460       1.16634
    April          8       2012    226.89787       1.16651
    April          9       2012    226.93113       1.16668
    April          10      2012    226.96440       1.16685
    April          11      2012    226.99767       1.16703
    April          12      2012    227.03093       1.16720
    April          13      2012    227.06420       1.16737
    April          14      2012    227.09747       1.16754
    April          15      2012    227.13073       1.16771
    April          16      2012    227.16400       1.16788
    April          17      2012    227.19727       1.16805
    April          18      2012    227.23053       1.16822
    April          19      2012    227.26380       1.16839
    April          20      2012    227.29707       1.16856
    April          21      2012    227.33033       1.16874
    April          22      2012    227.36360       1.16891
    April          23      2012    227.39687       1.16908
    April          24      2012    227.43013       1.16925
    April          25      2012    227.46340       1.16942
    April          26      2012    227.49667       1.16959
    April          27      2012    227.52993       1.16976
    April          28      2012    227.56320       1.16993
    April          29      2012    227.59647       1.17010
    April          30      2012    227.62973       1.17027