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3-5/8% 30-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for February 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            TIPS of April 2028
CUSIP NUMBER:                           912810FD5
DATED DATE:                             April 15, 1998
ORIGINAL ISSUE DATE:                    April 15, 1998
ADDITIONAL ISSUE DATE:                  July 15, 1998
MATURITY DATE:                          April 15, 2028
Ref CPI on DATED DATE:                  161.74000
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       1.22171
February        2        2006    197.57143       1.22154
February        3        2006    197.54286       1.22136
February        4        2006    197.51429       1.22118
February        5        2006    197.48571       1.22101
February        6        2006    197.45714       1.22083
February        7        2006    197.42857       1.22065
February        8        2006    197.40000       1.22048
February        9        2006    197.37143       1.22030
February        10       2006    197.34286       1.22012
February        11       2006    197.31429       1.21995
February        12       2006    197.28571       1.21977
February        13       2006    197.25714       1.21959
February        14       2006    197.22857       1.21942
February        15       2006    197.20000       1.21924
February        16       2006    197.17143       1.21906
February        17       2006    197.14286       1.21889
February        18       2006    197.11429       1.21871
February        19       2006    197.08571       1.21853
February        20       2006    197.05714       1.21836
February        21       2006    197.02857       1.21818
February        22       2006    197.00000       1.21800
February        23       2006    196.97143       1.21783
February        24       2006    196.94286       1.21765
February        25       2006    196.91429       1.21747
February        26       2006    196.88571       1.21730
February        27       2006    196.85714       1.21712
February        28       2006    196.82857       1.21694