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3-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2008

Ref CPI and Index Ratios for September 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:                     September 2006
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) May 2006                    202.5
    CPI-U (NSA) June 2006                   202.9
    CPI-U (NSA) July 2006                   203.5

    Month    Calendar Day    Year     Ref CPI      Index Ratio

    September       1        2006    202.90000       1.25592
    September       2        2006    202.92000       1.25604
    September       3        2006    202.94000       1.25617
    September       4        2006    202.96000       1.25629
    September       5        2006    202.98000       1.25642
    September       6        2006    203.00000       1.25654
    September       7        2006    203.02000       1.25666
    September       8        2006    203.04000       1.25679
    September       9        2006    203.06000       1.25691
    September       10       2006    203.08000       1.25703
    September       11       2006    203.10000       1.25716
    September       12       2006    203.12000       1.25728
    September       13       2006    203.14000       1.25741
    September       14       2006    203.16000       1.25753
    September       15       2006    203.18000       1.25765
    September       16       2006    203.20000       1.25778
    September       17       2006    203.22000       1.25790
    September       18       2006    203.24000       1.25802
    September       19       2006    203.26000       1.25815
    September       20       2006    203.28000       1.25827
    September       21       2006    203.30000       1.25840
    September       22       2006    203.32000       1.25852
    September       23       2006    203.34000       1.25864
    September       24       2006    203.36000       1.25877
    September       25       2006    203.38000       1.25889
    September       26       2006    203.40000       1.25902
    September       27       2006    203.42000       1.25914
    September       28       2006    203.44000       1.25926
    September       29       2006    203.46000       1.25939
    September       30       2006    203.48000       1.25951