What is the lowest average finish having top 5s of 0?
CREATE TABLE "career_statistics" (
  "year" text,
  "races" real,
  "wins" real,
  "top_5" real,
  "top_10" real,
  "poles" real,
  "avg_start" real,
  "avg_finish" real,
  "season_rank" text
);
SELECT MIN("avg_finish") FROM "career_statistics" WHERE "top_5"<0;