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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2013

Ref CPI and Index Ratios for December 2006

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series C-2013
    CUSIP NUMBER:                           912828BD1
    DATED DATE:                             July 15, 2003
    ORIGINAL ISSUE DATE:                    July 15, 2003
    ADDITIONAL ISSUE DATE:                  October 15, 2003
    MATURITY DATE:                          July 15, 2013
    Ref CPI on DATED DATE:                  183.66452
    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       1.10473
    December        2       2006    202.86452       1.10454
    December        3       2006    202.82903       1.10435
    December        4       2006    202.79355       1.10415
    December        5       2006    202.75806       1.10396
    December        6       2006    202.72258       1.10377
    December        7       2006    202.68710       1.10357
    December        8       2006    202.65161       1.10338
    December        9       2006    202.61613       1.10319
    December        10      2006    202.58065       1.10299
    December        11      2006    202.54516       1.10280
    December        12      2006    202.50968       1.10261
    December        13      2006    202.47419       1.10241
    December        14      2006    202.43871       1.10222
    December        15      2006    202.40323       1.10203
    December        16      2006    202.36774       1.10183
    December        17      2006    202.33226       1.10164
    December        18      2006    202.29677       1.10145
    December        19      2006    202.26129       1.10125
    December        20      2006    202.22581       1.10106
    December        21      2006    202.19032       1.10087
    December        22      2006    202.15484       1.10067
    December        23      2006    202.11935       1.10048
    December        24      2006    202.08387       1.10029
    December        25      2006    202.04839       1.10009
    December        26      2006    202.01290       1.09990
    December        27      2006    201.97742       1.09971
    December        28      2006    201.94194       1.09952
    December        29      2006    201.90645       1.09932
    December        30      2006    201.87097       1.09913
    December        31      2006    201.83548       1.09894