How many were in Attendance on February 21, 1988 against the New Jersey Saints?
CREATE TABLE "game_log" (
  "date" text,
  "at_vs" text,
  "opponent" text,
  "score" text,
  "attendance" real,
  "record" text
);
SELECT SUM("attendance") FROM "game_log" WHERE "opponent"='new jersey saints' AND "date"='february 21, 1988';