Name the attendance for atlanta braves opponent for september 9
CREATE TABLE table_14621 (
    "Date" text,
    "Opponent" text,
    "Score" text,
    "Loss" text,
    "Attendance" real,
    "Record" text
)
SELECT AVG("Attendance") FROM table_14621 WHERE "Opponent" = 'atlanta braves' AND "Date" = 'september 9'
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: Name the attendance for atlanta braves opponent for september 9 ### Input: CREATE TABLE table_14621 (
    "Date" text,
    "Opponent" text,
    "Score" text,
    "Loss" text,
    "Attendance" real,
    "Record" text
) ### Response: SELECT AVG("Attendance") FROM table_14621 WHERE "Opponent" = 'atlanta braves' AND "Date" = 'september 9'