user: Question: What was the size of the crowd when North Melbourne was the home 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: ['Footscray', '9.16 (70)', 'St Kilda', '13.14 (92)', 'Western Oval', 16000.0, '18 May 1940']
SQL:

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