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

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

CPI-U (NSA) December 2005               196.8
CPI-U (NSA) January 2006                198.3
CPI-U (NSA) February 2006               198.7

Month   Calendar Day    Year    Ref CPI       Index Ratio

April           1       2006    198.30000       1.01949
April           2       2006    198.31333       1.01956
April           3       2006    198.32667       1.01962
April           4       2006    198.34000       1.01969
April           5       2006    198.35333       1.01976
April           6       2006    198.36667       1.01983
April           7       2006    198.38000       1.01990
April           8       2006    198.39333       1.01997
April           9       2006    198.40667       1.02003
April           10      2006    198.42000       1.02010
April           11      2006    198.43333       1.02017
April           12      2006    198.44667       1.02024
April           13      2006    198.46000       1.02031
April           14      2006    198.47333       1.02038
April           15      2006    198.48667       1.02045
April           16      2006    198.50000       1.02051
April           17      2006    198.51333       1.02058
April           18      2006    198.52667       1.02065
April           19      2006    198.54000       1.02072
April           20      2006    198.55333       1.02079
April           21      2006    198.56667       1.02086
April           22      2006    198.58000       1.02093
April           23      2006    198.59333       1.02099
April           24      2006    198.60667       1.02106
April           25      2006    198.62000       1.02113
April           26      2006    198.63333       1.02120
April           27      2006    198.64667       1.02127
April           28      2006    198.66000       1.02134
April           29      2006    198.67333       1.02141
April           30      2006    198.68667       1.02147