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3-3/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2012

Ref CPI and Index Ratios for March 2007

     Contact: Office of Financing            202-504-3550
     DESCRIPTION:                            Series A-2012
     CUSIP NUMBER:                           9128277J5
     DATED DATE:                             January 15, 2002
     ORIGINAL ISSUE DATE:                    January 15, 2002
     ADDITIONAL ISSUE DATE:                  N/A
     MATURITY DATE:                          January 15, 2012
     Ref CPI on DATED DATE:                  177.56452
     TABLE FOR MONTH OF:                     March 2007
     NUMBER OF DAYS IN MONTH:                31

     CPI-U (NSA) November 2006               201.5
     CPI-U (NSA) December 2006               201.8
     CPI-U (NSA) January 2007                202.416

     Month    Calendar Day   Year    Ref CPI       Index Ratio

     March           1       2007    201.80000       1.13649
     March           2       2007    201.81987       1.13660
     March           3       2007    201.83974       1.13671
     March           4       2007    201.85961       1.13682
     March           5       2007    201.87948       1.13694
     March           6       2007    201.89935       1.13705
     March           7       2007    201.91923       1.13716
     March           8       2007    201.93910       1.13727
     March           9       2007    201.95897       1.13738
     March           10      2007    201.97884       1.13750
     March           11      2007    201.99871       1.13761
     March           12      2007    202.01858       1.13772
     March           13      2007    202.03845       1.13783
     March           14      2007    202.05832       1.13794
     March           15      2007    202.07819       1.13806
     March           16      2007    202.09806       1.13817
     March           17      2007    202.11794       1.13828
     March           18      2007    202.13781       1.13839
     March           19      2007    202.15768       1.13850
     March           20      2007    202.17755       1.13861
     March           21      2007    202.19742       1.13873
     March           22      2007    202.21729       1.13884
     March           23      2007    202.23716       1.13895
     March           24      2007    202.25703       1.13906
     March           25      2007    202.27690       1.13917
     March           26      2007    202.29677       1.13929
     March           27      2007    202.31665       1.13940
     March           28      2007    202.33652       1.13951
     March           29      2007    202.35639       1.13962
     March           30      2007    202.37626       1.13973
     March           31      2007    202.39613       1.13985