How many years had a 100 m hurdles event at the world championships in Osaka, Japan?
CREATE TABLE "achievements" (
  "year" real,
  "competition" text,
  "venue" text,
  "position" text,
  "event" text
);
SELECT SUM("year") FROM "achievements" WHERE "event"='100 m hurdles' AND "competition"='world championships' AND "venue"='osaka, japan';