When were the odds of winner 16.66?
CREATE TABLE "all_winners_of_olympiatravet" (
  "year" real,
  "horse" text,
  "driver" text,
  "trainer" text,
  "country_of_owner" text,
  "odds_of_winner" text,
  "winning_time_km_rate" text
);
SELECT "year" FROM "all_winners_of_olympiatravet" WHERE "odds_of_winner"='16.66';