user: Question: Which is the highest Season with a Percentage of 67% and Alberto Ascari as a Driver?
Columns: ['Driver', 'Season', 'Races', 'Poles', 'Percentage']
Types: ['text', 'real', 'real', 'real', 'text']
Sample row: ['Nigel Mansell', 1992.0, 16.0, 14.0, '88%']
SQL:

assistant: SELECT MAX("Season") FROM "Table" WHERE "Percentage" = '67%' AND "Driver" = 'Alberto Ascari';