John Hopewell Chief International CorrespondentSavaged by COVID-19, global box office plunged between 57% and 76% in major markets outside the U.S., with the U.K. and Ireland leading the rout, crashing 76% against 2019, according to a Comscore study, published Wednesday.Also hit hard were China (-70%), South Korea (-71%), and Italy and Spain (both down 72%).