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3-7/8% 30-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for March 2006

Contact: Office of Financing       202-504-3550
DESCRIPTION:                            TIPS of April 2029
CUSIP NUMBER:                           912810FH6
DATED DATE:                             April 15, 1999
ORIGINAL ISSUE DATE:                    April 15, 1999
ADDITIONAL ISSUE DATE:                  October 15, 1999
                                        October 16, 2000
MATURITY DATE:                          April 15, 2029
Ref CPI on DATED DATE:                  164.39333
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       1.19713
March           2       2006    196.84839       1.19742
March           3       2006    196.89677       1.19772
March           4       2006    196.94516       1.19801
March           5       2006    196.99355       1.19831
March           6       2006    197.04194       1.19860
March           7       2006    197.09032       1.19889
March           8       2006    197.13871       1.19919
March           9       2006    197.18710       1.19948
March           10      2006    197.23548       1.19978
March           11      2006    197.28387       1.20007
March           12      2006    197.33226       1.20037
March           13      2006    197.38065       1.20066
March           14      2006    197.42903       1.20096
March           15      2006    197.47742       1.20125
March           16      2006    197.52581       1.20154
March           17      2006    197.57419       1.20184
March           18      2006    197.62258       1.20213
March           19      2006    197.67097       1.20243
March           20      2006    197.71935       1.20272
March           21      2006    197.76774       1.20302
March           22      2006    197.81613       1.20331
March           23      2006    197.86452       1.20360
March           24      2006    197.91290       1.20390
March           25      2006    197.96129       1.20419
March           26      2006    198.00968       1.20449
March           27      2006    198.05806       1.20478
March           28      2006    198.10645       1.20508
March           29      2006    198.15484       1.20537
March           30      2006    198.20323       1.20566
March           31      2006    198.25161       1.20596