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1-5/8% 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-2015
CUSIP NUMBER:                           912828DH0
DATED DATE:                             January 15, 2005
ORIGINAL ISSUE DATE:                    January 18, 2005
ADDITIONAL ISSUE DATE:                  April 15, 2005
MATURITY DATE:                          January 15, 2015
Ref CPI on DATED DATE:                  190.94516
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       1.03066
March           2       2006    196.84839       1.03092
March           3       2006    196.89677       1.03117
March           4       2006    196.94516       1.03142
March           5       2006    196.99355       1.03168
March           6       2006    197.04194       1.03193
March           7       2006    197.09032       1.03218
March           8       2006    197.13871       1.03244
March           9       2006    197.18710       1.03269
March           10      2006    197.23548       1.03294
March           11      2006    197.28387       1.03320
March           12      2006    197.33226       1.03345
March           13      2006    197.38065       1.03370
March           14      2006    197.42903       1.03396
March           15      2006    197.47742       1.03421
March           16      2006    197.52581       1.03446
March           17      2006    197.57419       1.03472
March           18      2006    197.62258       1.03497
March           19      2006    197.67097       1.03522
March           20      2006    197.71935       1.03548
March           21      2006    197.76774       1.03573
March           22      2006    197.81613       1.03598
March           23      2006    197.86452       1.03624
March           24      2006    197.91290       1.03649
March           25      2006    197.96129       1.03674
March           26      2006    198.00968       1.03700
March           27      2006    198.05806       1.03725
March           28      2006    198.10645       1.03750
March           29      2006    198.15484       1.03776
March           30      2006    198.20323       1.03801
March           31      2006    198.25161       1.03826