user: Question: What is the smallest crowd at Punt Road Oval?
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', '22.23 (155)', 'Hawthorn', '8.8 (56)', 'Corio Oval', 8500.0, '18 June 1927']
SQL:

assistant: SELECT MIN("Crowd") FROM "Table" WHERE "Venue" = 'Punt Road Oval';