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1-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for October 2005

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            Series A-2015
CUSIP NUMBER:                           912828DH0
DATED DATE:                             January 15, 2005
ORIGINAL ISSUE DATE:                    January 18, 2005
ADDITIONAL ISSUE DATE:                  April 15, 2005
MATURITY DATE:                          January 15, 2015
Ref CPI on DATED DATE:                  190.94516
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       1.02333
October        2       2005    195.43226       1.02350
October        3       2005    195.46452       1.02367
October        4       2005    195.49677       1.02384
October        5       2005    195.52903       1.02401
October        6       2005    195.56129       1.02418
October        7       2005    195.59355       1.02434
October        8       2005    195.62581       1.02451
October        9       2005    195.65806       1.02468
October        10      2005    195.69032       1.02485
October        11      2005    195.72258       1.02502
October        12      2005    195.75484       1.02519
October        13      2005    195.78710       1.02536
October        14      2005    195.81935       1.02553
October        15      2005    195.85161       1.02570
October        16      2005    195.88387       1.02586
October        17      2005    195.91613       1.02603
October        18      2005    195.94839       1.02620
October        19      2005    195.98065       1.02637
October        20      2005    196.01290       1.02654
October        21      2005    196.04516       1.02671
October        22      2005    196.07742       1.02688
October        23      2005    196.10968       1.02705
October        24      2005    196.14194       1.02722
October        25      2005    196.17419       1.02738
October        26      2005    196.20645       1.02755
October        27      2005    196.23871       1.02772
October        28      2005    196.27097       1.02789
October        29      2005    196.30323       1.02806
October        30      2005    196.33548       1.02823
October        31      2005    196.36774       1.02840