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4-1/4% 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-2010
CUSIP NUMBER:                           9128275W8
DATED DATE:                             January 15, 2000
ORIGINAL ISSUE DATE:                    January 18, 2000
ADDITIONAL ISSUE DATE:                  July 17, 2000
MATURITY DATE:                          January 15, 2010
Ref CPI on DATED DATE:                  168.24516
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       1.16972
March           2       2006    196.84839       1.17001
March           3       2006    196.89677       1.17030
March           4       2006    196.94516       1.17058
March           5       2006    196.99355       1.17087
March           6       2006    197.04194       1.17116
March           7       2006    197.09032       1.17145
March           8       2006    197.13871       1.17173
March           9       2006    197.18710       1.17202
March           10      2006    197.23548       1.17231
March           11      2006    197.28387       1.17260
March           12      2006    197.33226       1.17289
March           13      2006    197.38065       1.17317
March           14      2006    197.42903       1.17346
March           15      2006    197.47742       1.17375
March           16      2006    197.52581       1.17404
March           17      2006    197.57419       1.17432
March           18      2006    197.62258       1.17461
March           19      2006    197.67097       1.17490
March           20      2006    197.71935       1.17519
March           21      2006    197.76774       1.17547
March           22      2006    197.81613       1.17576
March           23      2006    197.86452       1.17605
March           24      2006    197.91290       1.17634
March           25      2006    197.96129       1.17662
March           26      2006    198.00968       1.17691
March           27      2006    198.05806       1.17720
March           28      2006    198.10645       1.17749
March           29      2006    198.15484       1.17777
March           30      2006    198.20323       1.17806
March           31      2006    198.25161       1.17835