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

Ref CPI and Index Ratios for December 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:                  December 2006
    NUMBER OF DAYS IN MONTH:             31

    CPI-U (NSA) August 2006              203.9
    CPI-U (NSA) September 2006           202.9
    CPI-U (NSA) October 2006             201.8

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    December        1       2006    202.90000       1.25592
    December        2       2006    202.86452       1.25570
    December        3       2006    202.82903       1.25548
    December        4       2006    202.79355       1.25526
    December        5       2006    202.75806       1.25504
    December        6       2006    202.72258       1.25482
    December        7       2006    202.68710       1.25460
    December        8       2006    202.65161       1.25438
    December        9       2006    202.61613       1.25416
    December        10      2006    202.58065       1.25394
    December        11      2006    202.54516       1.25372
    December        12      2006    202.50968       1.25350
    December        13      2006    202.47419       1.25328
    December        14      2006    202.43871       1.25306
    December        15      2006    202.40323       1.25285
    December        16      2006    202.36774       1.25263
    December        17      2006    202.33226       1.25241
    December        18      2006    202.29677       1.25219
    December        19      2006    202.26129       1.25197
    December        20      2006    202.22581       1.25175
    December        21      2006    202.19032       1.25153
    December        22      2006    202.15484       1.25131
    December        23      2006    202.11935       1.25109
    December        24      2006    202.08387       1.25087
    December        25      2006    202.04839       1.25065
    December        26      2006    202.01290       1.25043
    December        27      2006    201.97742       1.25021
    December        28      2006    201.94194       1.24999
    December        29      2006    201.90645       1.24977
    December        30      2006    201.87097       1.24955
    December        31      2006    201.83548       1.24933