What's the lowest Year with a  Venue of casablanca and has the Time of 20.63w?
CREATE TABLE "achievements" (
  "year" real,
  "competition" text,
  "venue" text,
  "position" text,
  "event" text,
  "time" text
);
SELECT MIN("year") FROM "achievements" WHERE "venue"='casablanca' AND "time"='20.63w';