What is the crowd size of the game where the away team scored 8.15 (63)?
CREATE TABLE "round_1" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT SUM("crowd") FROM "round_1" WHERE "away_team_score"='8.15 (63)';