Which country has had 6 miss universe's?
CREATE TABLE "references" (
  "rank" real,
  "country" text,
  "miss_universe" text,
  "1st_runner_up" real,
  "2nd_runner_up" real,
  "3rd_runner_up" real,
  "4th_runner_up" real,
  "semifinalists" real,
  "total" real
);
SELECT "country" FROM "references" WHERE "miss_universe"='6';