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2-1/2% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2016

Ref CPI and Index Ratios for March 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series D-2016
    CUSIP NUMBER:                           912828FL9
    DATED DATE:                             July 15, 2006
    ORIGINAL ISSUE DATE:                    July 17, 2006
    ADDITIONAL ISSUE DATE:                  October 16, 2006
    MATURITY DATE:                          July 15, 2016
    Ref CPI on DATED DATE:                  201.95161
    TABLE FOR MONTH OF:                     March 2008
    NUMBER OF DAYS IN MONTH:                31

    CPI-U (NSA) November 2007               210.177
    CPI-U (NSA) December 2007               210.036
    CPI-U (NSA) January 2008                211.080

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    March           1       2008    210.03600       1.04003
    March           2       2008    210.06968       1.04020
    March           3       2008    210.10335       1.04036
    March           4       2008    210.13703       1.04053
    March           5       2008    210.17071       1.04070
    March           6       2008    210.20439       1.04087
    March           7       2008    210.23806       1.04103
    March           8       2008    210.27174       1.04120
    March           9       2008    210.30542       1.04137
    March           10      2008    210.33910       1.04153
    March           11      2008    210.37277       1.04170
    March           12      2008    210.40645       1.04187
    March           13      2008    210.44013       1.04203
    March           14      2008    210.47381       1.04220
    March           15      2008    210.50748       1.04237
    March           16      2008    210.54116       1.04253
    March           17      2008    210.57484       1.04270
    March           18      2008    210.60852       1.04287
    March           19      2008    210.64219       1.04303
    March           20      2008    210.67587       1.04320
    March           21      2008    210.70955       1.04337
    March           22      2008    210.74323       1.04353
    March           23      2008    210.77690       1.04370
    March           24      2008    210.81058       1.04387
    March           25      2008    210.84426       1.04403
    March           26      2008    210.87794       1.04420
    March           27      2008    210.91161       1.04437
    March           28      2008    210.94529       1.04453
    March           29      2008    210.97897       1.04470
    March           30      2008    211.01265       1.04487
    March           31      2008    211.04632       1.04503