Which artist created the silver dollar for the 400th anniversary of Quebec?
CREATE TABLE "gold_plated_proof_silver_dollars" (
  "year" real,
  "theme" text,
  "artist" text,
  "mintage" text,
  "issue_price" text
);
SELECT "artist" FROM "gold_plated_proof_silver_dollars" WHERE "theme"='400th anniversary of quebec';