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3-3/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for April 2006

Contact: Office of Financing       202-504-3550

DESCRIPTION:                            Series A-2007
CUSIP NUMBER:                           9128272M3
DATED DATE:                             January 15, 1997
ORIGINAL ISSUE DATE:                    February 6, 1997
ADDITIONAL ISSUE DATE:                  April 15, 1997
MATURITY DATE:                          January 15, 2007
Ref CPI on DATED DATE:                  158.43548
TABLE FOR MONTH OF:                     April 2006
NUMBER OF DAYS IN MONTH:                30

CPI-U (NSA) December 2005               196.8
CPI-U (NSA) January 2006                198.3
CPI-U (NSA) February 2006               198.7

Month   Calendar Day    Year    Ref CPI       Index Ratio

April          1        2006    198.30000       1.25161
April          2        2006    198.31333       1.25170
April          3        2006    198.32667       1.25178
April          4        2006    198.34000       1.25187
April          5        2006    198.35333       1.25195
April          6        2006    198.36667       1.25203
April          7        2006    198.38000       1.25212
April          8        2006    198.39333       1.25220
April          9        2006    198.40667       1.25229
April          10       2006    198.42000       1.25237
April          11       2006    198.43333       1.25246
April          12       2006    198.44667       1.25254
April          13       2006    198.46000       1.25262
April          14       2006    198.47333       1.25271
April          15       2006    198.48667       1.25279
April          16       2006    198.50000       1.25288
April          17       2006    198.51333       1.25296
April          18       2006    198.52667       1.25304
April          19       2006    198.54000       1.25313
April          20       2006    198.55333       1.25321
April          21       2006    198.56667       1.25330
April          22       2006    198.58000       1.25338
April          23       2006    198.59333       1.25347
April          24       2006    198.60667       1.25355
April          25       2006    198.62000       1.25363
April          26       2006    198.63333       1.25372
April          27       2006    198.64667       1.25380
April          28       2006    198.66000       1.25389
April          29       2006    198.67333       1.25397
April          30       2006    198.68667       1.25405