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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 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series 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 2007
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) December 2006               201.8
    CPI-U (NSA) January 2007                202.416
    CPI-U (NSA) February 2007               203.499

    Month   Calendar Day   Year    Ref CPI       Index Ratio

    April          1       2007    202.41600       1.04065
    April          2       2007    202.45210       1.04083
    April          3       2007    202.48820       1.04102
    April          4       2007    202.52430       1.04120
    April          5       2007    202.56040       1.04139
    April          6       2007    202.59650       1.04158
    April          7       2007    202.63260       1.04176
    April          8       2007    202.66870       1.04195
    April          9       2007    202.70480       1.04213
    April          10      2007    202.74090       1.04232
    April          11      2007    202.77700       1.04250
    April          12      2007    202.81310       1.04269
    April          13      2007    202.84920       1.04287
    April          14      2007    202.88530       1.04306
    April          15      2007    202.92140       1.04325
    April          16      2007    202.95750       1.04343
    April          17      2007    202.99360       1.04362
    April          18      2007    203.02970       1.04380
    April          19      2007    203.06580       1.04399
    April          20      2007    203.10190       1.04417
    April          21      2007    203.13800       1.04436
    April          22      2007    203.17410       1.04454
    April          23      2007    203.21020       1.04473
    April          24      2007    203.24630       1.04492
    April          25      2007    203.28240       1.04510
    April          26      2007    203.31850       1.04529
    April          27      2007    203.35460       1.04547
    April          28      2007    203.39070       1.04566
    April          29      2007    203.42680       1.04584
    April          30      2007    203.46290       1.04603