5th Runner-up smaller than 0 has the lowest semifinalists?
CREATE TABLE "top_20_countries_by_tally" (
  "rank" real,
  "country_territory" text,
  "miss_world" real,
  "1st_runner_up" real,
  "2nd_runner_up" real,
  "3rd_runner_up" real,
  "4th_runner_up" real,
  "5th_runner_up" real,
  "6th_runner_up" real,
  "semifinalists" real,
  "total" real
);
SELECT MIN("semifinalists") FROM "top_20_countries_by_tally" WHERE "5th_runner_up"<0;