user: Question: What is the smallest crowd size for 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: ['Fitzroy', '10.10 (70)', 'Richmond', '7.17 (59)', 'Brunswick Street Oval', 12000.0, '31 July 1943']
SQL:

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