What is the latest year when Call of Duty 4: Modern Warfare was the game?
CREATE TABLE "list_of_game_of_the_year_awards" (
  "year" real,
  "game" text,
  "genre" text,
  "platform_s" text,
  "developer_s" text
);
SELECT MAX("year") FROM "list_of_game_of_the_year_awards" WHERE "game"='call of duty 4: modern warfare';