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

Ref CPI and Index Ratios for February 2006

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:                     February 2006
NUMBER OF DAYS IN MONTH:                28

CPI-U (NSA) October 2005                199.2
CPI-U (NSA) November 2005               197.6
CPI-U (NSA) December 2005               196.8

Month   Calendar Day    Year    Ref CPI Index Ratio

February        1       2006    197.60000       1.03485
February        2       2006    197.57143       1.03470
February        3       2006    197.54286       1.03455
February        4       2006    197.51429       1.03440
February        5       2006    197.48571       1.03425
February        6       2006    197.45714       1.03410
February        7       2006    197.42857       1.03395
February        8       2006    197.40000       1.03380
February        9       2006    197.37143       1.03366
February        10      2006    197.34286       1.03351
February        11      2006    197.31429       1.03336
February        12      2006    197.28571       1.03321
February        13      2006    197.25714       1.03306
February        14      2006    197.22857       1.03291
February        15      2006    197.20000       1.03276
February        16      2006    197.17143       1.03261
February        17      2006    197.14286       1.03246
February        18      2006    197.11429       1.03231
February        19      2006    197.08571       1.03216
February        20      2006    197.05714       1.03201
February        21      2006    197.02857       1.03186
February        22      2006    197.00000       1.03171
February        23      2006    196.97143       1.03156
February        24      2006    196.94286       1.03141
February        25      2006    196.91429       1.03126
February        26      2006    196.88571       1.03111
February        27      2006    196.85714       1.03096
February        28      2006    196.82857       1.03081