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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for June 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            Series D-2015
CUSIP NUMBER:                           912828EA4
DATED DATE:                             July 15, 2005
ORIGINAL ISSUE DATE:                    July 15, 2005
ADDITIONAL ISSUE DATE:                  October 17, 2005
MATURITY DATE:                          July 15, 2015
Ref CPI on DATED DATE:                  194.50968
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       1.02720
June           2       2006    199.85667       1.02749
June           3       2006    199.91333       1.02778
June           4       2006    199.97000       1.02807
June           5       2006    200.02667       1.02836
June           6       2006    200.08333       1.02865
June           7       2006    200.14000       1.02895
June           8       2006    200.19667       1.02924
June           9       2006    200.25333       1.02953
June           10      2006    200.31000       1.02982
June           11      2006    200.36667       1.03011
June           12      2006    200.42333       1.03040
June           13      2006    200.48000       1.03069
June           14      2006    200.53667       1.03099
June           15      2006    200.59333       1.03128
June           16      2006    200.65000       1.03157
June           17      2006    200.70667       1.03186
June           18      2006    200.76333       1.03215
June           19      2006    200.82000       1.03244
June           20      2006    200.87667       1.03273
June           21      2006    200.93333       1.03302
June           22      2006    200.99000       1.03332
June           23      2006    201.04667       1.03361
June           24      2006    201.10333       1.03390
June           25      2006    201.16000       1.03419
June           26      2006    201.21667       1.03448
June           27      2006    201.27333       1.03477
June           28      2006    201.33000       1.03506
June           29      2006    201.38667       1.03536
June           30      2006    201.44333       1.03565