CREATE TABLE "round_17" (
  "date" text,
  "home_team" text,
  "score" text,
  "away_team" text,
  "venue" text,
  "crowd" real,
  "box_score" text,
  "report" text
);

Question: How many people attended the game when sydney spirit was at home?
SQL: SELECT "crowd" FROM "round_17" WHERE "home_team"='sydney spirit';