user: Question: What is the highest number of 5w when there was a 21.33 average?
Columns: ['Player', 'Matches', 'Overs', 'Maidens', 'Runs', 'Wickets', 'Average', 'Economy', '5w', '10w', 'Best Bowling']
Types: ['text', 'real', 'text', 'real', 'real', 'real', 'text', 'text', 'real', 'real', 'text']
Sample row: ['Ajmal Shahzad', 1.0, '24.0', 6.0, 64.0, 3.0, '21.33', '2.67', 0.0, 0.0, '2/43']
SQL:

assistant: SELECT MAX("5w") FROM "Table" WHERE "Average" = '21.33';