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2% 20-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for April 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            TIPS of January 2026
CUSIP NUMBER:                           912810FS2
DATED DATE:                             January 15, 2006
ORIGINAL ISSUE DATE:                    January 31, 2006
ADDITIONAL ISSUE DATE:                  N/A
MATURITY DATE:                          January 15, 2026
Ref CPI on DATED DATE:                  198.47742
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       0.99911
April           2       2006    198.31333       0.99917
April           3       2006    198.32667       0.99924
April           4       2006    198.34000       0.99931
April           5       2006    198.35333       0.99937
April           6       2006    198.36667       0.99944
April           7       2006    198.38000       0.99951
April           8       2006    198.39333       0.99958
April           9       2006    198.40667       0.99964
April           10      2006    198.42000       0.99971
April           11      2006    198.43333       0.99978
April           12      2006    198.44667       0.99985
April           13      2006    198.46000       0.99991
April           14      2006    198.47333       0.99998
April           15      2006    198.48667       1.00005
April           16      2006    198.50000       1.00011
April           17      2006    198.51333       1.00018
April           18      2006    198.52667       1.00025
April           19      2006    198.54000       1.00032
April           20      2006    198.55333       1.00038
April           21      2006    198.56667       1.00045
April           22      2006    198.58000       1.00052
April           23      2006    198.59333       1.00058
April           24      2006    198.60667       1.00065
April           25      2006    198.62000       1.00072
April           26      2006    198.63333       1.00079
April           27      2006    198.64667       1.00085
April           28      2006    198.66000       1.00092
April           29      2006    198.67333       1.00099
April           30      2006    198.68667       1.00105