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1-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for June 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            Series A-2015
CUSIP NUMBER:                           912828DH0
DATED DATE:                             January 15, 2005
ORIGINAL ISSUE DATE:                    January 18, 2005
ADDITIONAL ISSUE DATE:                  April 15, 2005
MATURITY DATE:                          January 15, 2015
Ref CPI on DATED DATE:                  190.94516
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       1.04637
June           2       2006    199.85667       1.04667
June           3       2006    199.91333       1.04697
June           4       2006    199.97000       1.04726
June           5       2006    200.02667       1.04756
June           6       2006    200.08333       1.04786
June           7       2006    200.14000       1.04815
June           8       2006    200.19667       1.04845
June           9       2006    200.25333       1.04875
June           10      2006    200.31000       1.04904
June           11      2006    200.36667       1.04934
June           12      2006    200.42333       1.04964
June           13      2006    200.48000       1.04993
June           14      2006    200.53667       1.05023
June           15      2006    200.59333       1.05053
June           16      2006    200.65000       1.05083
June           17      2006    200.70667       1.05112
June           18      2006    200.76333       1.05142
June           19      2006    200.82000       1.05172
June           20      2006    200.87667       1.05201
June           21      2006    200.93333       1.05231
June           22      2006    200.99000       1.05261
June           23      2006    201.04667       1.05290
June           24      2006    201.10333       1.05320
June           25      2006    201.16000       1.05350
June           26      2006    201.21667       1.05379
June           27      2006    201.27333       1.05409
June           28      2006    201.33000       1.05439
June           29      2006    201.38667       1.05468
June           30      2006    201.44333       1.05498