user: Question: What was the highest average attendance in the 2009 season?
Columns: ['League', 'Sport', 'Season', 'Total attendance', 'Average attendance']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['National Hockey League', 'Ice hockey', '2012–13', '12758849', 17721.0]
SQL:

assistant: SELECT MAX("Average attendance") FROM "Table" WHERE "Season" = '2009';