What is the average year of entries with additional color black?
CREATE TABLE table_10664 (
    "Year" real,
    "Main colour(s)" text,
    "Additional colour(s)" text,
    "Livery" text,
    "Additional major sponsor(s)" text
)
SELECT AVG("Year") FROM table_10664 WHERE "Additional colour(s)" = 'black'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the average year of entries with additional color black? ### Input: CREATE TABLE table_10664 (
    "Year" real,
    "Main colour(s)" text,
    "Additional colour(s)" text,
    "Livery" text,
    "Additional major sponsor(s)" text
) ### Response: SELECT AVG("Year") FROM table_10664 WHERE "Additional colour(s)" = 'black'