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3-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for March 2006

Contact: Office of Financing      202-504-3550
DESCRIPTION:                            Series A-2008
CUSIP NUMBER:                           9128273T7
DATED DATE:                             January 15, 1998
ORIGINAL ISSUE DATE:                    January 15, 1998
ADDITIONAL ISSUE DATE:                  October 15, 1998
MATURITY DATE:                          January 15, 2008
Ref CPI on DATED DATE:                  161.55484
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       1.21816
March           2       2006    196.84839       1.21846
March           3       2006    196.89677       1.21876
March           4       2006    196.94516       1.21906
March           5       2006    196.99355       1.21936
March           6       2006    197.04194       1.21966
March           7       2006    197.09032       1.21996
March           8       2006    197.13871       1.22026
March           9       2006    197.18710       1.22056
March           10      2006    197.23548       1.22086
March           11      2006    197.28387       1.22116
March           12      2006    197.33226       1.22146
March           13      2006    197.38065       1.22176
March           14      2006    197.42903       1.22206
March           15      2006    197.47742       1.22236
March           16      2006    197.52581       1.22265
March           17      2006    197.57419       1.22295
March           18      2006    197.62258       1.22325
March           19      2006    197.67097       1.22355
March           20      2006    197.71935       1.22385
March           21      2006    197.76774       1.22415
March           22      2006    197.81613       1.22445
March           23      2006    197.86452       1.22475
March           24      2006    197.91290       1.22505
March           25      2006    197.96129       1.22535
March           26      2006    198.00968       1.22565
March           27      2006    198.05806       1.22595
March           28      2006    198.10645       1.22625
March           29      2006    198.15484       1.22655
March           30      2006    198.20323       1.22685
March           31      2006    198.25161       1.22715