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4-1/4% 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-2010
CUSIP NUMBER:                           9128275W8
DATED DATE:                             January 15, 2000
ORIGINAL ISSUE DATE:                    January 18, 2000
ADDITIONAL ISSUE DATE:                  July 17, 2000
MATURITY DATE:                          January 15, 2010
Ref CPI on DATED DATE:                  168.24516
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       1.18161
December        2       2005    198.81290       1.18169
December        3       2005    198.82581       1.18176
December        4       2005    198.83871       1.18184
December        5       2005    198.85161       1.18192
December        6       2005    198.86452       1.18199
December        7       2005    198.87742       1.18207
December        8       2005    198.89032       1.18215
December        9       2005    198.90323       1.18222
December        10      2005    198.91613       1.18230
December        11      2005    198.92903       1.18238
December        12      2005    198.94194       1.18245
December        13      2005    198.95484       1.18253
December        14      2005    198.96774       1.18261
December        15      2005    198.98065       1.18268
December        16      2005    198.99355       1.18276
December        17      2005    199.00645       1.18284
December        18      2005    199.01935       1.18291
December        19      2005    199.03226       1.18299
December        20      2005    199.04516       1.18307
December        21      2005    199.05806       1.18314
December        22      2005    199.07097       1.18322
December        23      2005    199.08387       1.18330
December        24      2005    199.09677       1.18337
December        25      2005    199.10968       1.18345
December        26      2005    199.12258       1.18353
December        27      2005    199.13548       1.18360
December        28      2005    199.14839       1.18368
December        29      2005    199.16129       1.18376
December        30      2005    199.17419       1.18383
December        31      2005    199.18710       1.18391