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0-7/8% 5-1/2-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for December 2005

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            Series D-2010
CUSIP NUMBER:                           912828CZ1
DATED DATE:                             October 15, 2004
ORIGINAL ISSUE DATE:                    October 29, 2004
ADDITIONAL ISSUE DATE:                  April 29, 2005
                                        October 28, 2005
MATURITY DATE:                          April 15, 2010
Ref CPI on DATED DATE:                  189.44516
TABLE FOR MONTH OF:                     December 2005
NUMBER OF DAYS IN MONTH:                31

CPI-U (NSA) August 2005                 196.4
CPI-U (NSA) September 2005              198.8
CPI-U (NSA) October 2005                199.2

Month    Calendar Day    Year    Ref CPI      Index Ratio

December        1       2005    198.80000       1.04938
December        2       2005    198.81290       1.04945
December        3       2005    198.82581       1.04952
December        4       2005    198.83871       1.04958
December        5       2005    198.85161       1.04965
December        6       2005    198.86452       1.04972
December        7       2005    198.87742       1.04979
December        8       2005    198.89032       1.04986
December        9       2005    198.90323       1.04993
December        10      2005    198.91613       1.04999
December        11      2005    198.92903       1.05006
December        12      2005    198.94194       1.05013
December        13      2005    198.95484       1.05020
December        14      2005    198.96774       1.05027
December        15      2005    198.98065       1.05033
December        16      2005    198.99355       1.05040
December        17      2005    199.00645       1.05047
December        18      2005    199.01935       1.05054
December        19      2005    199.03226       1.05061
December        20      2005    199.04516       1.05067
December        21      2005    199.05806       1.05074
December        22      2005    199.07097       1.05081
December        23      2005    199.08387       1.05088
December        24      2005    199.09677       1.05095
December        25      2005    199.10968       1.05101
December        26      2005    199.12258       1.05108
December        27      2005    199.13548       1.05115
December        28      2005    199.14839       1.05122
December        29      2005    199.16129       1.05129
December        30      2005    199.17419       1.05136
December        31      2005    199.18710       1.05142