user: Question: What was the crowd size when essendon 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: ['North Melbourne', '11.8 (74)', 'Richmond', '9.10 (64)', 'Arden Street Oval', 20000.0, '22 April 1950']
SQL:

assistant: SELECT "Crowd" FROM "Table" WHERE "Away team" = 'essendon';