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

Ref CPI and Index Ratios for February 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            Series 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:                     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       1.01589
February        2       2006    197.57143       1.01574
February        3       2006    197.54286       1.01559
February        4       2006    197.51429       1.01545
February        5       2006    197.48571       1.01530
February        6       2006    197.45714       1.01515
February        7       2006    197.42857       1.01501
February        8       2006    197.40000       1.01486
February        9       2006    197.37143       1.01471
February        10      2006    197.34286       1.01457
February        11      2006    197.31429       1.01442
February        12      2006    197.28571       1.01427
February        13      2006    197.25714       1.01413
February        14      2006    197.22857       1.01398
February        15      2006    197.20000       1.01383
February        16      2006    197.17143       1.01368
February        17      2006    197.14286       1.01354
February        18      2006    197.11429       1.01339
February        19      2006    197.08571       1.01324
February        20      2006    197.05714       1.01310
February        21      2006    197.02857       1.01295
February        22      2006    197.00000       1.01280
February        23      2006    196.97143       1.01266
February        24      2006    196.94286       1.01251
February        25      2006    196.91429       1.01236
February        26      2006    196.88571       1.01222
February        27      2006    196.85714       1.01207
February        28      2006    196.82857       1.01192