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3-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for May 2005

Contact: Office of Financing      202-504-3550
DESCRIPTION:                            Series A-2008
CUSIP NUMBER:                           9128273T7
DATED DATE:                             January 15, 1998
ORIGINAL ISSUE DATE:                    January 15, 1998
ADDITIONAL ISSUE DATE:                  October 15, 1998
MATURITY DATE:                          January 15, 2008
Ref CPI on DATED DATE:                  161.55484
TABLE FOR MONTH OF:                     May 2005
NUMBER OF DAYS IN MONTH:                31

CPI-U (NSA) January 2005                190.7
CPI-U (NSA) February 2005               191.8
CPI-U (NSA) March 2005                  193.3

Month   Calendar Day    Year    Ref CPI       Index Ratio

May             1       2005    191.80000       1.18721
May             2       2005    191.84839       1.18751
May             3       2005    191.89677       1.18781
May             4       2005    191.94516       1.18811
May             5       2005    191.99355       1.18841
May             6       2005    192.04194       1.18871
May             7       2005    192.09032       1.18901
May             8       2005    192.13871       1.18931
May             9       2005    192.18710       1.18961
May             10      2005    192.23548       1.18991
May             11      2005    192.28387       1.19021
May             12      2005    192.33226       1.19051
May             13      2005    192.38065       1.19081
May             14      2005    192.42903       1.19111
May             15      2005    192.47742       1.19141
May             16      2005    192.52581       1.19171
May             17      2005    192.57419       1.19201
May             18      2005    192.62258       1.19230
May             19      2005    192.67097       1.19260
May             20      2005    192.71935       1.19290
May             21      2005    192.76774       1.19320
May             22      2005    192.81613       1.19350
May             23      2005    192.86452       1.19380
May             24      2005    192.91290       1.19410
May             25      2005    192.96129       1.19440
May             26      2005    193.00968       1.19470
May             27      2005    193.05806       1.19500
May             28      2005    193.10645       1.19530
May             29      2005    193.15484       1.19560
May             30      2005    193.20323       1.19590
May             31      2005    193.25161       1.19620