How many years have an Original title of иваново детство?
CREATE TABLE "films_directed_by_tarkovsky" (
  "year" real,
  "english_title" text,
  "original_title" text,
  "country" text,
  "length" text
);
SELECT COUNT("year") FROM "films_directed_by_tarkovsky" WHERE "original_title"='иваново детство';