CREATE TABLE table_36456 ("Driver" TEXT, "Season" FLOAT, "Races" FLOAT, "Poles" FLOAT, "Percentage" TEXT)

Which is the highest Season with a Percentage of 67% and Alberto Ascari as a Driver?
SELECT MAX("Season") FROM table_36456 WHERE "Percentage" = '67%' AND "Driver" = 'alberto ascari'
SELECT MAX("Season") FROM "table_36456" WHERE "Driver" = 'alberto ascari' AND "Percentage" = '67%'