area where the cost-of-living differential for any calendar year is greater than 125 percent, the applicable multiplier for such calendar year is 90 percent of such differential. (ii) For each statistical area where the cost-of-living differential for any calendar year exceeds 97 percent but does not exceed 125 percent, the applicable multiplier for such calendar year is 1.05. (iii) For each statistical area not described in clause (i) or (ii), the applicable multiplier is the cost-of-living differential for the calendar year. (C) Cost-of-living differential The cost-of-living differential for any statistical area for any calendar year is the percentage determined by dividing— (i) the cost-of-living for such area for the preceding calendar year