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

Ref CPI and Index Ratios for June 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:                     June 2006
NUMBER OF DAYS IN MONTH:                30

CPI-U (NSA) February 2006               198.7
CPI-U (NSA) March 2006                  199.8
CPI-U (NSA) April 2006                  201.5

Month   Calendar Day    Year    Ref CPI      Index Ratio

June           1       2006    199.80000       1.23532
June           2       2006    199.85667       1.23567
June           3       2006    199.91333       1.23602
June           4       2006    199.97000       1.23637
June           5       2006    200.02667       1.23672
June           6       2006    200.08333       1.23707
June           7       2006    200.14000       1.23742
June           8       2006    200.19667       1.23777
June           9       2006    200.25333       1.23812
June           10      2006    200.31000       1.23847
June           11      2006    200.36667       1.23882
June           12      2006    200.42333       1.23917
June           13      2006    200.48000       1.23952
June           14      2006    200.53667       1.23987
June           15      2006    200.59333       1.24022
June           16      2006    200.65000       1.24057
June           17      2006    200.70667       1.24092
June           18      2006    200.76333       1.24127
June           19      2006    200.82000       1.24162
June           20      2006    200.87667       1.24197
June           21      2006    200.93333       1.24232
June           22      2006    200.99000       1.24267
June           23      2006    201.04667       1.24302
June           24      2006    201.10333       1.24337
June           25      2006    201.16000       1.24372
June           26      2006    201.21667       1.24407
June           27      2006    201.27333       1.24443
June           28      2006    201.33000       1.24478
June           29      2006    201.38667       1.24513
June           30      2006    201.44333       1.24548