user: Question: When North Melbourne played as the away team, what was the crowd numbers?
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', '15.13 (103)', 'Richmond', '9.11 (65)', 'Kardinia Park', 19565.0, '30 April 1955']
SQL:

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