What is the party of the prime minister who left office on 11 March 1983?
CREATE TABLE "rank_by_time_in_office" (
  "rank" real,
  "prime_minister" text,
  "party" text,
  "assumed_office" text,
  "left_office" text,
  "total_time_in_office" text
);
SELECT "party" FROM "rank_by_time_in_office" WHERE "left_office"='11 march 1983';