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_name_13 (year INTEGER, opponent VARCHAR)
  ### Question:
  Name the average year for manly-warringah sea eagles
  ### Answer:
  SELECT AVG(year) FROM table_name_13 WHERE opponent = "manly-warringah sea eagles"