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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for January 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            Series D-2015
CUSIP NUMBER:                           912828EA4
DATED DATE:                             July 15, 2005
ORIGINAL ISSUE DATE:                    July 15, 2005
ADDITIONAL ISSUE DATE:                  October 17, 2005
MATURITY DATE:                          July 15, 2015
Ref CPI on DATED DATE:                  194.50968
TABLE FOR MONTH OF:                     January 2006
NUMBER OF DAYS IN MONTH:                31

CPI-U (NSA) September 2005              198.8
CPI-U (NSA) October 2005                199.2
CPI-U (NSA) November 2005               197.6

Month   Calendar Day    Year    Ref CPI       Index Ratio

January         1       2006    199.20000       1.02411
January         2       2006    199.14839       1.02385
January         3       2006    199.09677       1.02358
January         4       2006    199.04516       1.02332
January         5       2006    198.99355       1.02305
January         6       2006    198.94194       1.02279
January         7       2006    198.89032       1.02252
January         8       2006    198.83871       1.02226
January         9       2006    198.78710       1.02199
January         10      2006    198.73548       1.02173
January         11      2006    198.68387       1.02146
January         12      2006    198.63226       1.02119
January         13      2006    198.58065       1.02093
January         14      2006    198.52903       1.02066
January         15      2006    198.47742       1.02040
January         16      2006    198.42581       1.02013
January         17      2006    198.37419       1.01987
January         18      2006    198.32258       1.01960
January         19      2006    198.27097       1.01934
January         20      2006    198.21935       1.01907
January         21      2006    198.16774       1.01881
January         22      2006    198.11613       1.01854
January         23      2006    198.06452       1.01828
January         24      2006    198.01290       1.01801
January         25      2006    197.96129       1.01775
January         26      2006    197.90968       1.01748
January         27      2006    197.85806       1.01721
January         28      2006    197.80645       1.01695
January         29      2006    197.75484       1.01668
January         30      2006    197.70323       1.01642
January         31      2006    197.65161       1.01615