How many for percentages are there when the against percentage is 35,782 (69)?
CREATE TABLE "by_constituency" (
  "constituency" text,
  "electorate" real,
  "s_spoilt_vote" real,
  "total_poll_pct" text,
  "for_pct" text,
  "against_pct" text
);
SELECT "for_pct" FROM "by_constituency" WHERE "against_pct"='35,782 (69)';