Who was the champion when the attendance was 70,000?
CREATE TABLE "german_championship_finals_under_the_gau" (
  "year" real,
  "champion" text,
  "runner_up" text,
  "result" text,
  "date" text,
  "venue" text,
  "attendance" text
);
SELECT "champion" FROM "german_championship_finals_under_the_gau" WHERE "attendance"='70,000';