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1-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for December 2005

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            Series A-2015
CUSIP NUMBER:                           912828DH0
DATED DATE:                             January 15, 2005
ORIGINAL ISSUE DATE:                    January 18, 2005
ADDITIONAL ISSUE DATE:                  April 15, 2005
MATURITY DATE:                          January 15, 2015
Ref CPI on DATED DATE:                  190.94516
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       1.04114
December        2       2005    198.81290       1.04120
December        3       2005    198.82581       1.04127
December        4       2005    198.83871       1.04134
December        5       2005    198.85161       1.04141
December        6       2005    198.86452       1.04147
December        7       2005    198.87742       1.04154
December        8       2005    198.89032       1.04161
December        9       2005    198.90323       1.04168
December        10      2005    198.91613       1.04174
December        11      2005    198.92903       1.04181
December        12      2005    198.94194       1.04188
December        13      2005    198.95484       1.04195
December        14      2005    198.96774       1.04202
December        15      2005    198.98065       1.04208
December        16      2005    198.99355       1.04215
December        17      2005    199.00645       1.04222
December        18      2005    199.01935       1.04229
December        19      2005    199.03226       1.04235
December        20      2005    199.04516       1.04242
December        21      2005    199.05806       1.04249
December        22      2005    199.07097       1.04256
December        23      2005    199.08387       1.04262
December        24      2005    199.09677       1.04269
December        25      2005    199.10968       1.04276
December        26      2005    199.12258       1.04283
December        27      2005    199.13548       1.04289
December        28      2005    199.14839       1.04296
December        29      2005    199.16129       1.04303
December        30      2005    199.17419       1.04310
December        31      2005    199.18710       1.04316