What is the number of the crowd when the away team score was 10.18 (78)?
CREATE TABLE "round_9" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT COUNT("crowd") FROM "round_9" WHERE "away_team_score"='10.18 (78)';