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

Ref CPI and Index Ratios for January 2006

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:                     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       1.05149
January         2       2006    199.14839       1.05122
January         3       2006    199.09677       1.05095
January         4       2006    199.04516       1.05067
January         5       2006    198.99355       1.05040
January         6       2006    198.94194       1.05013
January         7       2006    198.89032       1.04986
January         8       2006    198.83871       1.04958
January         9       2006    198.78710       1.04931
January         10      2006    198.73548       1.04904
January         11      2006    198.68387       1.04877
January         12      2006    198.63226       1.04849
January         13      2006    198.58065       1.04822
January         14      2006    198.52903       1.04795
January         15      2006    198.47742       1.04768
January         16      2006    198.42581       1.04741
January         17      2006    198.37419       1.04713
January         18      2006    198.32258       1.04686
January         19      2006    198.27097       1.04659
January         20      2006    198.21935       1.04632
January         21      2006    198.16774       1.04604
January         22      2006    198.11613       1.04577
January         23      2006    198.06452       1.04550
January         24      2006    198.01290       1.04523
January         25      2006    197.96129       1.04495
January         26      2006    197.90968       1.04468
January         27      2006    197.85806       1.04441
January         28      2006    197.80645       1.04414
January         29      2006    197.75484       1.04386
January         30      2006    197.70323       1.04359
January         31      2006    197.65161       1.04332