Which is the highest Season with a Percentage of 67% and Alberto Ascari as a Driver?
CREATE TABLE "highest_percentage_of_pole_positions_in_" (
  "driver" text,
  "season" real,
  "races" real,
  "poles" real,
  "percentage" text
);
SELECT MAX("season") FROM "highest_percentage_of_pole_positions_in_" WHERE "percentage"='67%' AND "driver"='alberto ascari';