user: Question: How many people were in 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: ['Geelong', '12.8 (80)', 'Richmond', '15.8 (98)', 'Kardinia Park', 21655.0, '21 May 1966']
SQL:

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