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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for October 2005

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:                  N/A
MATURITY DATE:                          July 15, 2015
Ref CPI on DATED DATE:                  194.50968
TABLE FOR MONTH OF:                     October 2005
NUMBER OF DAYS IN MONTH:                31

CPI-U (NSA) June 2005                   194.5
CPI-U (NSA) July 2005                   195.4
CPI-U (NSA) August 2005                 196.4

Month   Calendar Day    Year    Ref CPI      Index Ratio

October        1       2005    195.40000       1.00458
October        2       2005    195.43226       1.00474
October        3       2005    195.46452       1.00491
October        4       2005    195.49677       1.00507
October        5       2005    195.52903       1.00524
October        6       2005    195.56129       1.00541
October        7       2005    195.59355       1.00557
October        8       2005    195.62581       1.00574
October        9       2005    195.65806       1.00590
October        10      2005    195.69032       1.00607
October        11      2005    195.72258       1.00624
October        12      2005    195.75484       1.00640
October        13      2005    195.78710       1.00657
October        14      2005    195.81935       1.00673
October        15      2005    195.85161       1.00690
October        16      2005    195.88387       1.00706
October        17      2005    195.91613       1.00723
October        18      2005    195.94839       1.00740
October        19      2005    195.98065       1.00756
October        20      2005    196.01290       1.00773
October        21      2005    196.04516       1.00789
October        22      2005    196.07742       1.00806
October        23      2005    196.10968       1.00823
October        24      2005    196.14194       1.00839
October        25      2005    196.17419       1.00856
October        26      2005    196.20645       1.00872
October        27      2005    196.23871       1.00889
October        28      2005    196.27097       1.00906
October        29      2005    196.30323       1.00922
October        30      2005    196.33548       1.00939
October        31      2005    196.36774       1.00955