definiens: means the Consumer Price Index for U.S. City Averages for all Urban Customers, All Items, as com piled and published by the United States Bureau of Labor Statistics ( 1984 = 100 ), and the means the Price Index for Cost of Living for Private Households in Germany, as compiled and published in the monthly r eport of the German Bundesbank . If the Bureau of Labor Stati stics or the German Bundesbank substantially revise s the manner in which either the CPI or the CPI - G is dete rmined, an adjustment shall be made in the revised index that will produce results equivalent, as nearly as possi ble, to those that would be obtained if the CPI or the CPI - G, as the case may be, had not been so revised . If either the CPI or the CPI - G specified in this Section is no longer available, the JRDT shall substitute a comparable i ndex based upon changes in the cost of living or pu rchasing power of the consumer dollar published by another U nited States governmental agency ( in the case of th e CPI ) or by another German governmental agency or financi al institution ( in the case of the CPI - G )