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

Ref CPI and Index Ratios for May 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:                     May 2006
NUMBER OF DAYS IN MONTH:                31

CPI-U (NSA) January 2006                198.3
CPI-U (NSA) February 2006               198.7
CPI-U (NSA) March 2006                  199.8

Month   Calendar Day    Year    Ref CPI       Index Ratio

May             1       2006    198.70000       1.20869
May             2       2006    198.73548       1.20890
May             3       2006    198.77097       1.20912
May             4       2006    198.80645       1.20933
May             5       2006    198.84194       1.20955
May             6       2006    198.87742       1.20977
May             7       2006    198.91290       1.20998
May             8       2006    198.94839       1.21020
May             9       2006    198.98387       1.21041
May             10      2006    199.01935       1.21063
May             11      2006    199.05484       1.21084
May             12      2006    199.09032       1.21106
May             13      2006    199.12581       1.21128
May             14      2006    199.16129       1.21149
May             15      2006    199.19677       1.21171
May             16      2006    199.23226       1.21192
May             17      2006    199.26774       1.21214
May             18      2006    199.30323       1.21236
May             19      2006    199.33871       1.21257
May             20      2006    199.37419       1.21279
May             21      2006    199.40968       1.21300
May             22      2006    199.44516       1.21322
May             23      2006    199.48065       1.21344
May             24      2006    199.51613       1.21365
May             25      2006    199.55161       1.21387
May             26      2006    199.58710       1.21408
May             27      2006    199.62258       1.21430
May             28      2006    199.65806       1.21451
May             29      2006    199.69355       1.21473
May             30      2006    199.72903       1.21495
May             31      2006    199.76452       1.21516