What's the total attendance of the leagues in season of 2010?
CREATE TABLE "top_10_in_total_attendance" (
  "league" text,
  "sport" text,
  "country" text,
  "season" text,
  "games" real,
  "average_attendance" real,
  "total_attendance" real
);
SELECT COUNT("total_attendance") FROM "top_10_in_total_attendance" WHERE "season"='2010';