user: Question: What was the smallest crowd when Melbourne 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: ['Richmond', '14.11 (95)', 'South Melbourne', '2.19 (31)', 'MCG', 18692.0, '10 June 1972']
SQL:

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