user: ### NOW ANSWER:
Question: What was the crowd size when Geelong played at home?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Geelong', '18.17 (125)', 'Richmond', '15.8 (98)', 'Kardinia Park', 20566.0, '22 April 1978']
SQL:

assistant: SELECT AVG("Crowd") FROM "Table" WHERE "Home team" = 'Geelong';