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3-5/8% 30-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for January 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            TIPS of April 2028
CUSIP NUMBER:                           912810FD5
DATED DATE:                             April 15, 1998
ORIGINAL ISSUE DATE:                    April 15, 1998
ADDITIONAL ISSUE DATE:                  July 15, 1998
MATURITY DATE:                          April 15, 2028
Ref CPI on DATED DATE:                  161.74000
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       1.23161
January         2       2006    199.14839       1.23129
January         3       2006    199.09677       1.23097
January         4       2006    199.04516       1.23065
January         5       2006    198.99355       1.23033
January         6       2006    198.94194       1.23001
January         7       2006    198.89032       1.22969
January         8       2006    198.83871       1.22937
January         9       2006    198.78710       1.22905
January         10      2006    198.73548       1.22873
January         11      2006    198.68387       1.22842
January         12      2006    198.63226       1.22810
January         13      2006    198.58065       1.22778
January         14      2006    198.52903       1.22746
January         15      2006    198.47742       1.22714
January         16      2006    198.42581       1.22682
January         17      2006    198.37419       1.22650
January         18      2006    198.32258       1.22618
January         19      2006    198.27097       1.22586
January         20      2006    198.21935       1.22554
January         21      2006    198.16774       1.22522
January         22      2006    198.11613       1.22490
January         23      2006    198.06452       1.22459
January         24      2006    198.01290       1.22427
January         25      2006    197.96129       1.22395
January         26      2006    197.90968       1.22363
January         27      2006    197.85806       1.22331
January         28      2006    197.80645       1.22299
January         29      2006    197.75484       1.22267
January         30      2006    197.70323       1.22235
January         31      2006    197.65161       1.22203