Which year was the 100 m event played in Thessaloniki, Greece?
CREATE TABLE "major_competition_record" (
  "year" real,
  "competition" text,
  "venue" text,
  "position" text,
  "event" text
);
SELECT MIN("year") FROM "major_competition_record" WHERE "event"='100 m' AND "venue"='thessaloniki, greece';