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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 C-2013
CUSIP NUMBER:                           912828BD1
DATED DATE:                             July 15, 2003
ORIGINAL ISSUE DATE:                    July 15, 2003
ADDITIONAL ISSUE DATE:                  October 15, 2003
MATURITY DATE:                          July 15, 2013
Ref CPI on DATED DATE:                  183.66452
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       1.08459
January         2       2006    199.14839       1.08431
January         3       2006    199.09677       1.08402
January         4       2006    199.04516       1.08374
January         5       2006    198.99355       1.08346
January         6       2006    198.94194       1.08318
January         7       2006    198.89032       1.08290
January         8       2006    198.83871       1.08262
January         9       2006    198.78710       1.08234
January         10      2006    198.73548       1.08206
January         11      2006    198.68387       1.08178
January         12      2006    198.63226       1.08149
January         13      2006    198.58065       1.08121
January         14      2006    198.52903       1.08093
January         15      2006    198.47742       1.08065
January         16      2006    198.42581       1.08037
January         17      2006    198.37419       1.08009
January         18      2006    198.32258       1.07981
January         19      2006    198.27097       1.07953
January         20      2006    198.21935       1.07925
January         21      2006    198.16774       1.07897
January         22      2006    198.11613       1.07868
January         23      2006    198.06452       1.07840
January         24      2006    198.01290       1.07812
January         25      2006    197.96129       1.07784
January         26      2006    197.90968       1.07756
January         27      2006    197.85806       1.07728
January         28      2006    197.80645       1.07700
January         29      2006    197.75484       1.07672
January         30      2006    197.70323       1.07644
January         31      2006    197.65161       1.07616