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

Ref CPI and Index Ratios for May 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:                     May 2007
   NUMBER OF DAYS IN MONTH:                31

   CPI-U (NSA) January 2007                202.416
   CPI-U (NSA) February 2007               203.499
   CPI-U (NSA) March 2007                  205.352

   Month   Calendar Day    Year    Ref CPI       Index Ratio

   May             1       2007    203.49900       1.24085
   May             2       2007    203.55877       1.24121
   May             3       2007    203.61855       1.24158
   May             4       2007    203.67832       1.24194
   May             5       2007    203.73810       1.24231
   May             6       2007    203.79787       1.24267
   May             7       2007    203.85765       1.24303
   May             8       2007    203.91742       1.24340
   May             9       2007    203.97719       1.24376
   May             10      2007    204.03697       1.24413
   May             11      2007    204.09674       1.24449
   May             12      2007    204.15652       1.24486
   May             13      2007    204.21629       1.24522
   May             14      2007    204.27606       1.24559
   May             15      2007    204.33584       1.24595
   May             16      2007    204.39561       1.24631
   May             17      2007    204.45539       1.24668
   May             18      2007    204.51516       1.24704
   May             19      2007    204.57494       1.24741
   May             20      2007    204.63471       1.24777
   May             21      2007    204.69448       1.24814
   May             22      2007    204.75426       1.24850
   May             23      2007    204.81403       1.24887
   May             24      2007    204.87381       1.24923
   May             25      2007    204.93358       1.24960
   May             26      2007    204.99335       1.24996
   May             27      2007    205.05313       1.25032
   May             28      2007    205.11290       1.25069
   May             29      2007    205.17268       1.25105
   May             30      2007    205.23245       1.25142
   May             31      2007    205.29223       1.25178