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1-5/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2015

Ref CPI and Index Ratios for April 2008

     Contact: Office of Financing            202-504-3550
     DESCRIPTION:                            Series A-2015
     CUSIP NUMBER:                           912828DH0
     DATED DATE:                             January 15, 2005
     ORIGINAL ISSUE DATE:                    January 18, 2005
     ADDITIONAL ISSUE DATE:                  April 15, 2005
     MATURITY DATE:                          January 15, 2015
     Ref CPI on DATED DATE:                  190.94516
     TABLE FOR MONTH OF:                     April 2008
     NUMBER OF DAYS IN MONTH:                30

     CPI-U (NSA) December 2007               210.036
     CPI-U (NSA) January 2008                211.080
     CPI-U (NSA) February 2008               211.693

     Month   Calendar Day    Year    Ref CPI       Index Ratio

     April        1          2008    211.08000       1.10545
     April        2          2008    211.10043       1.10556
     April        3          2008    211.12087       1.10566
     April        4          2008    211.14130       1.10577
     April        5          2008    211.16173       1.10588
     April        6          2008    211.18217       1.10598
     April        7          2008    211.20260       1.10609
     April        8          2008    211.22303       1.10620
     April        9          2008    211.24347       1.10630
     April        10         2008    211.26390       1.10641
     April        11         2008    211.28433       1.10652
     April        12         2008    211.30477       1.10663
     April        13         2008    211.32520       1.10673
     April        14         2008    211.34563       1.10684
     April        15         2008    211.36607       1.10695
     April        16         2008    211.38650       1.10705
     April        17         2008    211.40693       1.10716
     April        18         2008    211.42737       1.10727
     April        19         2008    211.44780       1.10737
     April        20         2008    211.46823       1.10748
     April        21         2008    211.48867       1.10759
     April        22         2008    211.50910       1.10770
     April        23         2008    211.52953       1.10780
     April        24         2008    211.54997       1.10791
     April        25         2008    211.57040       1.10802
     April        26         2008    211.59083       1.10812
     April        27         2008    211.61127       1.10823
     April        28         2008    211.63170       1.10834
     April        29         2008    211.65213       1.10844
     April        30         2008    211.67257       1.10855