What is the total share with Timeslot of 8:30 p.m., anAir Date of march 27, 2008, and a Rank greater than 65?
CREATE TABLE "weekly_ratings" (
  "episode" text,
  "air_date" text,
  "timeslot" text,
  "rating" real,
  "share" real,
  "18_49_rating_share" text,
  "viewers_m" real,
  "rank_timeslot" real,
  "rank_night" text,
  "rank_overall" real
);
SELECT SUM("share") FROM "weekly_ratings" WHERE "timeslot"='8:30 p.m.' AND "air_date"='march 27, 2008' AND "rank_overall">65;