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

Ref CPI and Index Ratios for August 2006

    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:                   August 2006
    NUMBER OF DAYS IN MONTH:              31

    CPI-U (NSA) April 2006                201.5
    CPI-U (NSA) May 2006                  202.5
    CPI-U (NSA) June 2006                 202.9

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    August          1       2006    202.50000       1.04108
    August          2       2006    202.51290       1.04115
    August          3       2006    202.52581       1.04121
    August          4       2006    202.53871       1.04128
    August          5       2006    202.55161       1.04134
    August          6       2006    202.56452       1.04141
    August          7       2006    202.57742       1.04148
    August          8       2006    202.59032       1.04154
    August          9       2006    202.60323       1.04161
    August          10      2006    202.61613       1.04168
    August          11      2006    202.62903       1.04174
    August          12      2006    202.64194       1.04181
    August          13      2006    202.65484       1.04188
    August          14      2006    202.66774       1.04194
    August          15      2006    202.68065       1.04201
    August          16      2006    202.69355       1.04207
    August          17      2006    202.70645       1.04214
    August          18      2006    202.71935       1.04221
    August          19      2006    202.73226       1.04227
    August          20      2006    202.74516       1.04234
    August          21      2006    202.75806       1.04241
    August          22      2006    202.77097       1.04247
    August          23      2006    202.78387       1.04254
    August          24      2006    202.79677       1.04261
    August          25      2006    202.80968       1.04267
    August          26      2006    202.82258       1.04274
    August          27      2006    202.83548       1.04280
    August          28      2006    202.84839       1.04287
    August          29      2006    202.86129       1.04294
    August          30      2006    202.87419       1.04300
    August          31      2006    202.88710       1.04307