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3-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for April 2006

Contact: Office of Financing      202-504-3550
DESCRIPTION:                            Series A-2009
CUSIP NUMBER:                           9128274Y5
DATED DATE:                             January 15, 1999
ORIGINAL ISSUE DATE:                    January 15, 1999
ADDITIONAL ISSUE DATE:                  July 15, 1999
MATURITY DATE:                          January 15, 2009
Ref CPI on DATED DATE:                  164.00000
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       1.20915
April           2       2006    198.31333       1.20923
April           3       2006    198.32667       1.20931
April           4       2006    198.34000       1.20939
April           5       2006    198.35333       1.20947
April           6       2006    198.36667       1.20955
April           7       2006    198.38000       1.20963
April           8       2006    198.39333       1.20972
April           9       2006    198.40667       1.20980
April           10      2006    198.42000       1.20988
April           11      2006    198.43333       1.20996
April           12      2006    198.44667       1.21004
April           13      2006    198.46000       1.21012
April           14      2006    198.47333       1.21020
April           15      2006    198.48667       1.21028
April           16      2006    198.50000       1.21037
April           17      2006    198.51333       1.21045
April           18      2006    198.52667       1.21053
April           19      2006    198.54000       1.21061
April           20      2006    198.55333       1.21069
April           21      2006    198.56667       1.21077
April           22      2006    198.58000       1.21085
April           23      2006    198.59333       1.21093
April           24      2006    198.60667       1.21102
April           25      2006    198.62000       1.21110
April           26      2006    198.63333       1.21118
April           27      2006    198.64667       1.21126
April           28      2006    198.66000       1.21134
April           29      2006    198.67333       1.21142
April           30      2006    198.68667       1.21150