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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2015

Ref CPI and Index Ratios for December 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:                     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       1.04314
    December        2       2006    202.86452       1.04295
    December        3       2006    202.82903       1.04277
    December        4       2006    202.79355       1.04259
    December        5       2006    202.75806       1.04241
    December        6       2006    202.72258       1.04222
    December        7       2006    202.68710       1.04204
    December        8       2006    202.65161       1.04186
    December        9       2006    202.61613       1.04168
    December        10      2006    202.58065       1.04149
    December        11      2006    202.54516       1.04131
    December        12      2006    202.50968       1.04113
    December        13      2006    202.47419       1.04095
    December        14      2006    202.43871       1.04076
    December        15      2006    202.40323       1.04058
    December        16      2006    202.36774       1.04040
    December        17      2006    202.33226       1.04022
    December        18      2006    202.29677       1.04003
    December        19      2006    202.26129       1.03985
    December        20      2006    202.22581       1.03967
    December        21      2006    202.19032       1.03949
    December        22      2006    202.15484       1.03930
    December        23      2006    202.11935       1.03912
    December        24      2006    202.08387       1.03894
    December        25      2006    202.04839       1.03876
    December        26      2006    202.01290       1.03858
    December        27      2006    201.97742       1.03839
    December        28      2006    201.94194       1.03821
    December        29      2006    201.90645       1.03803
    December        30      2006    201.87097       1.03785
    December        31      2006    201.83548       1.03766