user: Question: What was the smallest crowd at a game when Richmond was the away team?
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', '7.15 (57)', 'South Melbourne', '9.10 (64)', 'Kardinia Park', 14933.0, '2 July 1977']
SQL:

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