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3-7/8% 30-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due April 15, 2029

Ref CPI and Index Ratios for January 2008

   Contact: Office of Financing            202-504-3550

   DESCRIPTION:                            TIPS of April 2029
   CUSIP NUMBER:                           912810FH6
   DATED DATE:                             April 15, 1999
   ORIGINAL ISSUE DATE:                    April 15, 1999
   ADDITIONAL ISSUE DATE:                  October 15, 1999
                                           October 16, 2000
   MATURITY DATE:                          April 15, 2029
   Ref CPI on DATED DATE:                  164.39333
   TABLE FOR MONTH OF:                     January 2008
   NUMBER OF DAYS IN MONTH:                31

   CPI-U (NSA) September 2007              208.490
   CPI-U (NSA) October 2007                208.936
   CPI-U (NSA) November 2007               210.177

   Month   Calendar Day    Year    Ref CPI       Index Ratio

   January         1       2008    208.93600       1.27095
   January         2       2008    208.97603       1.27120
   January         3       2008    209.01606       1.27144
   January         4       2008    209.05610       1.27168
   January         5       2008    209.09613       1.27193
   January         6       2008    209.13616       1.27217
   January         7       2008    209.17619       1.27241
   January         8       2008    209.21623       1.27266
   January         9       2008    209.25626       1.27290
   January         10      2008    209.29629       1.27314
   January         11      2008    209.33632       1.27339
   January         12      2008    209.37635       1.27363
   January         13      2008    209.41639       1.27387
   January         14      2008    209.45642       1.27412
   January         15      2008    209.49645       1.27436
   January         16      2008    209.53648       1.27460
   January         17      2008    209.57652       1.27485
   January         18      2008    209.61655       1.27509
   January         19      2008    209.65658       1.27534
   January         20      2008    209.69661       1.27558
   January         21      2008    209.73665       1.27582
   January         22      2008    209.77668       1.27607
   January         23      2008    209.81671       1.27631
   January         24      2008    209.85674       1.27655
   January         25      2008    209.89677       1.27680
   January         26      2008    209.93681       1.27704
   January         27      2008    209.97684       1.27728
   January         28      2008    210.01687       1.27753
   January         29      2008    210.05690       1.27777
   January         30      2008    210.09694       1.27801
   January         31      2008    210.13697       1.27826