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_91 (attendance INTEGER, opponent VARCHAR, round VARCHAR)
### Question:
Which Attendance has an Opponent of perth glory, and a Round of 9?
### Answer:
SELECT MIN(attendance) FROM table_name_91 WHERE opponent = "perth glory" AND round = "9"