Who were the Runner(s)-up with the winning score of −16 (66-68-70-68=272)?
CREATE TABLE "champions_tour_wins_8" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "runner_s_up" FROM "champions_tour_wins_8" WHERE "winning_score"='−16 (66-68-70-68=272)';