text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_103084_4 (year VARCHAR, bbc_one_rank VARCHAR)
  ### Question:
  How many years did BBC One rank 20th?
  ### Answer:
  SELECT COUNT(year) FROM table_103084_4 WHERE bbc_one_rank = "20th"