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3-5/8% 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-2008
CUSIP NUMBER:                           9128273T7
DATED DATE:                             January 15, 1998
ORIGINAL ISSUE DATE:                    January 15, 1998
ADDITIONAL ISSUE DATE:                  October 15, 1998
MATURITY DATE:                          January 15, 2008
Ref CPI on DATED DATE:                  161.55484
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       1.22311
February        2        2006    197.57143       1.22294
February        3        2006    197.54286       1.22276
February        4        2006    197.51429       1.22258
February        5        2006    197.48571       1.22241
February        6        2006    197.45714       1.22223
February        7        2006    197.42857       1.22205
February        8        2006    197.40000       1.22188
February        9        2006    197.37143       1.22170
February        10       2006    197.34286       1.22152
February        11       2006    197.31429       1.22135
February        12       2006    197.28571       1.22117
February        13       2006    197.25714       1.22099
February        14       2006    197.22857       1.22081
February        15       2006    197.20000       1.22064
February        16       2006    197.17143       1.22046
February        17       2006    197.14286       1.22028
February        18       2006    197.11429       1.22011
February        19       2006    197.08571       1.21993
February        20       2006    197.05714       1.21975
February        21       2006    197.02857       1.21958
February        22       2006    197.00000       1.21940
February        23       2006    196.97143       1.21922
February        24       2006    196.94286       1.21905
February        25       2006    196.91429       1.21887
February        26       2006    196.88571       1.21869
February        27       2006    196.85714       1.21852
February        28       2006    196.82857       1.21834