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4-1/4% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS)

Ref CPI and Index Ratios for May 2006

Contact: Office of Financing      202-504-3550
DESCRIPTION:                            Series A-2010
CUSIP NUMBER:                           9128275W8
DATED DATE:                             January 15, 2000
ORIGINAL ISSUE DATE:                    January 18, 2000
ADDITIONAL ISSUE DATE:                  July 17, 2000
MATURITY DATE:                          January 15, 2010
Ref CPI on DATED DATE:                  168.24516
TABLE FOR MONTH OF:                     May 2006
NUMBER OF DAYS IN MONTH:                31

CPI-U (NSA) January 2006                198.3
CPI-U (NSA) February 2006               198.7
CPI-U (NSA) March 2006                  199.8

Month   Calendar Day    Year    Ref CPI       Index Ratio

May             1       2006    198.70000       1.18101
May             2       2006    198.73548       1.18123
May             3       2006    198.77097       1.18144
May             4       2006    198.80645       1.18165
May             5       2006    198.84194       1.18186
May             6       2006    198.87742       1.18207
May             7       2006    198.91290       1.18228
May             8       2006    198.94839       1.18249
May             9       2006    198.98387       1.18270
May             10      2006    199.01935       1.18291
May             11      2006    199.05484       1.18312
May             12      2006    199.09032       1.18333
May             13      2006    199.12581       1.18355
May             14      2006    199.16129       1.18376
May             15      2006    199.19677       1.18397
May             16      2006    199.23226       1.18418
May             17      2006    199.26774       1.18439
May             18      2006    199.30323       1.18460
May             19      2006    199.33871       1.18481
May             20      2006    199.37419       1.18502
May             21      2006    199.40968       1.18523
May             22      2006    199.44516       1.18544
May             23      2006    199.48065       1.18565
May             24      2006    199.51613       1.18587
May             25      2006    199.55161       1.18608
May             26      2006    199.58710       1.18629
May             27      2006    199.62258       1.18650
May             28      2006    199.65806       1.18671
May             29      2006    199.69355       1.18692
May             30      2006    199.72903       1.18713
May             31      2006    199.76452       1.18734