applicable percentage
(I) Applicable percentage The term “applicable percentage” means— (aa) 50 percent or more during the initial applicable 1-year period and the succeeding 8 1-year periods; (bb) 55 percent or more during the 1-year period beginning on December 20, 2015 , and the 1-year period beginning on December 20, 2016 ; and (cc) 60 percent or more during the 1-year period beginning on December 20, 2017 , and each of the 7 succeeding 1-year periods.