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2% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2016

Ref CPI and Index Ratios for April 2007

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series A-2016
    CUSIP NUMBER:                           912828ET3
    DATED DATE:                             January 15, 2006
    ORIGINAL ISSUE DATE:                    January 17, 2006
    ADDITIONAL ISSUE DATE:                  April 17, 2006
    MATURITY DATE:                          January 15, 2016
    Ref CPI on DATED DATE:                  198.47742
    TABLE FOR MONTH OF:                     April 2007
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) December 2006               201.8
    CPI-U (NSA) January 2007                202.416
    CPI-U (NSA) February 2007               203.499

    Month   Calendar Day   Year    Ref CPI       Index Ratio

    April          1       2007    202.41600       1.01984
    April          2       2007    202.45210       1.02003
    April          3       2007    202.48820       1.02021
    April          4       2007    202.52430       1.02039
    April          5       2007    202.56040       1.02057
    April          6       2007    202.59650       1.02075
    April          7       2007    202.63260       1.02094
    April          8       2007    202.66870       1.02112
    April          9       2007    202.70480       1.02130
    April          10      2007    202.74090       1.02148
    April          11      2007    202.77700       1.02166
    April          12      2007    202.81310       1.02184
    April          13      2007    202.84920       1.02203
    April          14      2007    202.88530       1.02221
    April          15      2007    202.92140       1.02239
    April          16      2007    202.95750       1.02257
    April          17      2007    202.99360       1.02275
    April          18      2007    203.02970       1.02294
    April          19      2007    203.06580       1.02312
    April          20      2007    203.10190       1.02330
    April          21      2007    203.13800       1.02348
    April          22      2007    203.17410       1.02366
    April          23      2007    203.21020       1.02385
    April          24      2007    203.24630       1.02403
    April          25      2007    203.28240       1.02421
    April          26      2007    203.31850       1.02439
    April          27      2007    203.35460       1.02457
    April          28      2007    203.39070       1.02475
    April          29      2007    203.42680       1.02494
    April          30      2007    203.46290       1.02512