What is the latest year that shadow racing team scored more than 0 points?
CREATE TABLE "complete_formula_one_world_championship_" (
  "year" real,
  "entrant" text,
  "chassis" text,
  "engine" text,
  "pts" real
);
SELECT MAX("year") FROM "complete_formula_one_world_championship_" WHERE "entrant"='shadow racing team' AND "pts">0;