How many times is the award ceremony laurence olivier award, result is won and the nominee is imelda staunton?
CREATE TABLE "2012_london_revival" (
  "year" real,
  "award_ceremony" text,
  "category" text,
  "nominee" text,
  "result" text
);
SELECT COUNT("year") FROM "2012_london_revival" WHERE "award_ceremony"='laurence olivier award' AND "result"='won' AND "nominee"='imelda staunton';