What is the total number of runners-up for a club with winning years of 2010?
CREATE TABLE "performance_by_club" (
  "club" text,
  "winners" real,
  "runners_up" real,
  "winning_years" text,
  "runner_up_years" text
);
SELECT COUNT("runners_up") FROM "performance_by_club" WHERE "winning_years"='2010';