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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for March 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            Series C-2013
CUSIP NUMBER:                           912828BD1
DATED DATE:                             July 15, 2003
ORIGINAL ISSUE DATE:                    July 15, 2003
ADDITIONAL ISSUE DATE:                  October 15, 2003
MATURITY DATE:                          July 15, 2013
Ref CPI on DATED DATE:                  183.66452
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       1.07152
March           2       2006    196.84839       1.07178
March           3       2006    196.89677       1.07205
March           4       2006    196.94516       1.07231
March           5       2006    196.99355       1.07257
March           6       2006    197.04194       1.07284
March           7       2006    197.09032       1.07310
March           8       2006    197.13871       1.07336
March           9       2006    197.18710       1.07363
March           10      2006    197.23548       1.07389
March           11      2006    197.28387       1.07415
March           12      2006    197.33226       1.07442
March           13      2006    197.38065       1.07468
March           14      2006    197.42903       1.07494
March           15      2006    197.47742       1.07521
March           16      2006    197.52581       1.07547
March           17      2006    197.57419       1.07573
March           18      2006    197.62258       1.07600
March           19      2006    197.67097       1.07626
March           20      2006    197.71935       1.07652
March           21      2006    197.76774       1.07679
March           22      2006    197.81613       1.07705
March           23      2006    197.86452       1.07731
March           24      2006    197.91290       1.07758
March           25      2006    197.96129       1.07784
March           26      2006    198.00968       1.07811
March           27      2006    198.05806       1.07837
March           28      2006    198.10645       1.07863
March           29      2006    198.15484       1.07890
March           30      2006    198.20323       1.07916
March           31      2006    198.25161       1.07942