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

Ref CPI and Index Ratios for April 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:                     April 2005
NUMBER OF DAYS IN MONTH:                30
CPI-U (NSA) December 2004               190.3
CPI-U (NSA) January 2005                190.7
CPI-U (NSA) February 2005               191.8

Month   Calendar Day    Year    Ref CPI       Index Ratio

April           1       2005    190.70000       1.18040
April           2       2005    190.73667       1.18063
April           3       2005    190.77333       1.18086
April           4       2005    190.81000       1.18109
April           5       2005    190.84667       1.18131
April           6       2005    190.88333       1.18154
April           7       2005    190.92000       1.18177
April           8       2005    190.95667       1.18199
April           9       2005    190.99333       1.18222
April           10      2005    191.03000       1.18245
April           11      2005    191.06667       1.18267
April           12      2005    191.10333       1.18290
April           13      2005    191.14000       1.18313
April           14      2005    191.17667       1.18335
April           15      2005    191.21333       1.18358
April           16      2005    191.25000       1.18381
April           17      2005    191.28667       1.18404
April           18      2005    191.32333       1.18426
April           19      2005    191.36000       1.18449
April           20      2005    191.39667       1.18472
April           21      2005    191.43333       1.18494
April           22      2005    191.47000       1.18517
April           23      2005    191.50667       1.18540
April           24      2005    191.54333       1.18562
April           25      2005    191.58000       1.18585
April           26      2005    191.61667       1.18608
April           27      2005    191.65333       1.18631
April           28      2005    191.69000       1.18653
April           29      2005    191.72667       1.18676
April           30      2005    191.76333       1.18699