Name the year that Birds of a feather category for most popular actress was nominated
CREATE TABLE "awards_and_nominations" (
  "year" real,
  "nominated_for" text,
  "award" text,
  "category" text,
  "result" text
);
SELECT AVG("year") FROM "awards_and_nominations" WHERE "category"='most popular actress' AND "nominated_for"='birds of a feather';