What is the sum of District, when Took Office is greater than 1981, and when Senator is Cyndi Taylor Krier?
CREATE TABLE "senate" (
  "senator" text,
  "party" text,
  "district" real,
  "home_town" text,
  "took_office" real
);
SELECT SUM("district") FROM "senate" WHERE "took_office">1981 AND "senator"='cyndi taylor krier';