What was the most recent year when a g-force chassis started in 1st?
CREATE TABLE "indy_500_results" (
  "year" real,
  "chassis" text,
  "engine" text,
  "start" text,
  "finish" text,
  "team" text
);
SELECT MAX("year") FROM "indy_500_results" WHERE "start"='1st' AND "chassis"='g-force';