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_9 (year INTEGER, additional_colour_s_ VARCHAR)
### Question:
What is the average year of entries with additional color black?
### Answer:
SELECT AVG(year) FROM table_name_9 WHERE additional_colour_s_ = "black"