What year did Canada get a silver in the olympics in the Men's Coxless Pair event?
CREATE TABLE "coaching_titles" (
  "year" real,
  "championship" text,
  "event" text,
  "nation" text,
  "result" text
);
SELECT MIN("year") FROM "coaching_titles" WHERE "nation"='canada' AND "result"='silver' AND "championship"='olympics' AND "event"='men''s coxless pair';