What is the combined of Crowd when richmond played at home?
CREATE TABLE table_name_91 (
    crowd VARCHAR,
    home_team VARCHAR
)
SELECT COUNT(crowd) FROM table_name_91 WHERE home_team = "richmond"
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 combined of Crowd when richmond played at home? ### Input: CREATE TABLE table_name_91 (
    crowd VARCHAR,
    home_team VARCHAR
) ### Response: SELECT COUNT(crowd) FROM table_name_91 WHERE home_team = "richmond"