user: Question: What was the top crowd when Essendon played away?
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', '10.12 (72)', 'Melbourne', '14.22 (106)', 'Kardinia Park', 20247.0, '22 May 1971']
SQL:

assistant: SELECT MAX("Crowd") FROM "Table" WHERE "Away team" = 'Essendon';