What was the most recent race at Kyalami with Keke Rosberg competing?
CREATE TABLE "non_championship_results" (
  "year" real,
  "event" text,
  "venue" text,
  "driver" text,
  "result" text
);
SELECT MAX("year") FROM "non_championship_results" WHERE "venue"='kyalami' AND "driver"='keke rosberg';