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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 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:                     April 2011
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) December 2010               219.179
    CPI-U (NSA) January 2011                220.223
    CPI-U (NSA) February 2011               221.309

    Month   Calendar Day   Year    Ref CPI      Index Ratio

    April          1       2011    220.22300       1.13220
    April          2       2011    220.25920       1.13238
    April          3       2011    220.29540       1.13257
    April          4       2011    220.33160       1.13275
    April          5       2011    220.36780       1.13294
    April          6       2011    220.40400       1.13313
    April          7       2011    220.44020       1.13331
    April          8       2011    220.47640       1.13350
    April          9       2011    220.51260       1.13368
    April          10      2011    220.54880       1.13387
    April          11      2011    220.58500       1.13406
    April          12      2011    220.62120       1.13424
    April          13      2011    220.65740       1.13443
    April          14      2011    220.69360       1.13461
    April          15      2011    220.72980       1.13480
    April          16      2011    220.76600       1.13499
    April          17      2011    220.80220       1.13517
    April          18      2011    220.83840       1.13536
    April          19      2011    220.87460       1.13555
    April          20      2011    220.91080       1.13573
    April          21      2011    220.94700       1.13592
    April          22      2011    220.98320       1.13610
    April          23      2011    221.01940       1.13629
    April          24      2011    221.05560       1.13648
    April          25      2011    221.09180       1.13666
    April          26      2011    221.12800       1.13685
    April          27      2011    221.16420       1.13703
    April          28      2011    221.20040       1.13722
    April          29      2011    221.23660       1.13741
    April          30      2011    221.27280       1.13759