Team of elgin city, and a Highest smaller than 537 had what total number of average?
CREATE TABLE "stadia_and_attendances" (
  "team" text,
  "stadium" text,
  "capacity" real,
  "highest" real,
  "lowest" real,
  "average" real
);
SELECT COUNT("average") FROM "stadia_and_attendances" WHERE "team"='elgin city' AND "highest"<537;