When the Away team footscray played on the Date of 19 july 1980, what was the amount of people in the Crowd?
CREATE TABLE "round_16" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT "crowd" FROM "round_16" WHERE "date"='19 july 1980' AND "away_team"='footscray';