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3-5/8% 30-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for March 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                           TIPS of April 2028
CUSIP NUMBER:                          912810FD5
DATED DATE:                            April 15, 1998
ORIGINAL ISSUE DATE:                   April 15, 1998
ADDITIONAL ISSUE DATE:                 July 15, 1998
MATURITY DATE:                         April 15, 2028
Ref CPI on DATED DATE:                 161.74000
TABLE FOR MONTH OF:                    March 2006
NUMBER OF DAYS IN MONTH:               31

CPI-U (NSA) November 2005              197.6
CPI-U (NSA) December 2005              196.8
CPI-U (NSA) January 2006               198.3

Month   Calendar Day    Year    Ref CPI       Index Ratio

March           1       2006    196.80000       1.21677
March           2       2006    196.84839       1.21707
March           3       2006    196.89677       1.21737
March           4       2006    196.94516       1.21767
March           5       2006    196.99355       1.21796
March           6       2006    197.04194       1.21826
March           7       2006    197.09032       1.21856
March           8       2006    197.13871       1.21886
March           9       2006    197.18710       1.21916
March           10      2006    197.23548       1.21946
March           11      2006    197.28387       1.21976
March           12      2006    197.33226       1.22006
March           13      2006    197.38065       1.22036
March           14      2006    197.42903       1.22066
March           15      2006    197.47742       1.22096
March           16      2006    197.52581       1.22126
March           17      2006    197.57419       1.22155
March           18      2006    197.62258       1.22185
March           19      2006    197.67097       1.22215
March           20      2006    197.71935       1.22245
March           21      2006    197.76774       1.22275
March           22      2006    197.81613       1.22305
March           23      2006    197.86452       1.22335
March           24      2006    197.91290       1.22365
March           25      2006    197.96129       1.22395
March           26      2006    198.00968       1.22425
March           27      2006    198.05806       1.22455
March           28      2006    198.10645       1.22485
March           29      2006    198.15484       1.22514
March           30      2006    198.20323       1.22544
March           31      2006    198.25161       1.22574