<prompt> Feleletša polelo e latelago: Franz Isenegger ke motšea-karolo wa Swiss yo a bego a phadišana ka bobong mathomong a bo-1980. O thopile dimetale tše pedi ka go ditiragalo tša banna ba bane go FIBT World Championships ka silifera ka  <response>: 1981 le gauta ka 1982. 