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3-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due January 15, 2009

Ref CPI and Index Ratios for April 2007

   Contact: Office of Financing            202-504-3550
   DESCRIPTION:                            Series A-2009
   CUSIP NUMBER:                           9128274Y5
   DATED DATE:                             January 15, 1999
   ORIGINAL ISSUE DATE:                    January 15, 1999
   ADDITIONAL ISSUE DATE:                  July 15, 1999
   MATURITY DATE:                          January 15, 2009
   Ref CPI on DATED DATE:                  164.00000
   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       1.23424
   April          2       2007    202.45210       1.23446
   April          3       2007    202.48820       1.23468
   April          4       2007    202.52430       1.23490
   April          5       2007    202.56040       1.23512
   April          6       2007    202.59650       1.23534
   April          7       2007    202.63260       1.23556
   April          8       2007    202.66870       1.23578
   April          9       2007    202.70480       1.23600
   April          10      2007    202.74090       1.23623
   April          11      2007    202.77700       1.23645
   April          12      2007    202.81310       1.23667
   April          13      2007    202.84920       1.23689
   April          14      2007    202.88530       1.23711
   April          15      2007    202.92140       1.23733
   April          16      2007    202.95750       1.23755
   April          17      2007    202.99360       1.23777
   April          18      2007    203.02970       1.23799
   April          19      2007    203.06580       1.23821
   April          20      2007    203.10190       1.23843
   April          21      2007    203.13800       1.23865
   April          22      2007    203.17410       1.23887
   April          23      2007    203.21020       1.23909
   April          24      2007    203.24630       1.23931
   April          25      2007    203.28240       1.23953
   April          26      2007    203.31850       1.23975
   April          27      2007    203.35460       1.23997
   April          28      2007    203.39070       1.24019
   April          29      2007    203.42680       1.24041
   April          30      2007    203.46290       1.24063