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0-7/8% 5-1/2-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for March 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            Series D-2010
CUSIP NUMBER:                           912828CZ1
DATED DATE:                             October 15, 2004
ORIGINAL ISSUE DATE:                    October 29, 2004
ADDITIONAL ISSUE DATE:                  April 29, 2005
                                        October 28, 2005
MATURITY DATE:                          April 15, 2010
Ref CPI on DATED DATE:                  189.44516
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       1.03882
March           2       2006    196.84839       1.03908
March           3       2006    196.89677       1.03933
March           4       2006    196.94516       1.03959
March           5       2006    196.99355       1.03984
March           6       2006    197.04194       1.04010
March           7       2006    197.09032       1.04036
March           8       2006    197.13871       1.04061
March           9       2006    197.18710       1.04087
March           10      2006    197.23548       1.04112
March           11      2006    197.28387       1.04138
March           12      2006    197.33226       1.04163
March           13      2006    197.38065       1.04189
March           14      2006    197.42903       1.04214
March           15      2006    197.47742       1.04240
March           16      2006    197.52581       1.04265
March           17      2006    197.57419       1.04291
March           18      2006    197.62258       1.04317
March           19      2006    197.67097       1.04342
March           20      2006    197.71935       1.04368
March           21      2006    197.76774       1.04393
March           22      2006    197.81613       1.04419
March           23      2006    197.86452       1.04444
March           24      2006    197.91290       1.04470
March           25      2006    197.96129       1.04495
March           26      2006    198.00968       1.04521
March           27      2006    198.05806       1.04546
March           28      2006    198.10645       1.04572
March           29      2006    198.15484       1.04597
March           30      2006    198.20323       1.04623
March           31      2006    198.25161       1.04649