What year was the margin of victory 9 strokes and the purse under $2,750,000?
CREATE TABLE "lpga_major_championship" (
  "year" real,
  "dates" text,
  "venue" text,
  "champion" text,
  "country" text,
  "score" real,
  "to_par" text,
  "margin_of_victory" text,
  "runner_s_up" text,
  "purse" real,
  "winner_s_share" real
);
SELECT AVG("year") FROM "lpga_major_championship" WHERE "margin_of_victory"='9 strokes' AND "purse"<'2,750,000';