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3% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for December 2005

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            Series C-2012
CUSIP NUMBER:                           912828AF7
DATED DATE:                             July 15, 2002
ORIGINAL ISSUE DATE:                    July 15, 2002
ADDITIONAL ISSUE DATE:                  October 15, 2002
                                        January 15, 2003
MATURITY DATE:                          July 15, 2012
Ref CPI on DATED DATE:                  179.80000
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       1.10567
December        2       2005    198.81290       1.10574
December        3       2005    198.82581       1.10582
December        4       2005    198.83871       1.10589
December        5       2005    198.85161       1.10596
December        6       2005    198.86452       1.10603
December        7       2005    198.87742       1.10610
December        8       2005    198.89032       1.10618
December        9       2005    198.90323       1.10625
December        10      2005    198.91613       1.10632
December        11      2005    198.92903       1.10639
December        12      2005    198.94194       1.10646
December        13      2005    198.95484       1.10653
December        14      2005    198.96774       1.10661
December        15      2005    198.98065       1.10668
December        16      2005    198.99355       1.10675
December        17      2005    199.00645       1.10682
December        18      2005    199.01935       1.10689
December        19      2005    199.03226       1.10696
December        20      2005    199.04516       1.10704
December        21      2005    199.05806       1.10711
December        22      2005    199.07097       1.10718
December        23      2005    199.08387       1.10725
December        24      2005    199.09677       1.10732
December        25      2005    199.10968       1.10740
December        26      2005    199.12258       1.10747
December        27      2005    199.13548       1.10754
December        28      2005    199.14839       1.10761
December        29      2005    199.16129       1.10768
December        30      2005    199.17419       1.10775
December        31      2005    199.18710       1.10783