user: Question: What is the lowest crowd with home team Richmond?
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', '16.11 (107)', 'Melbourne', '5.16 (46)', 'Kardinia Park', 15000.0, '12 July 1947']
SQL:

assistant: SELECT MIN("Crowd") FROM "Table" WHERE "Home team" = 'Richmond';