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3-3/8% 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-2012
CUSIP NUMBER:                           9128277J5
DATED DATE:                             January 15, 2002
ORIGINAL ISSUE DATE:                    January 15, 2002
ADDITIONAL ISSUE DATE:                  N/A
MATURITY DATE:                          January 15, 2012
Ref CPI on DATED DATE:                  177.56452
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       1.10833
March           2       2006    196.84839       1.10860
March           3       2006    196.89677       1.10887
March           4       2006    196.94516       1.10915
March           5       2006    196.99355       1.10942
March           6       2006    197.04194       1.10969
March           7       2006    197.09032       1.10996
March           8       2006    197.13871       1.11024
March           9       2006    197.18710       1.11051
March           10      2006    197.23548       1.11078
March           11      2006    197.28387       1.11105
March           12      2006    197.33226       1.11133
March           13      2006    197.38065       1.11160
March           14      2006    197.42903       1.11187
March           15      2006    197.47742       1.11214
March           16      2006    197.52581       1.11242
March           17      2006    197.57419       1.11269
March           18      2006    197.62258       1.11296
March           19      2006    197.67097       1.11323
March           20      2006    197.71935       1.11351
March           21      2006    197.76774       1.11378
March           22      2006    197.81613       1.11405
March           23      2006    197.86452       1.11432
March           24      2006    197.91290       1.11460
March           25      2006    197.96129       1.11487
March           26      2006    198.00968       1.11514
March           27      2006    198.05806       1.11541
March           28      2006    198.10645       1.11569
March           29      2006    198.15484       1.11596
March           30      2006    198.20323       1.11623
March           31      2006    198.25161       1.11650