Who was the artist for the year of the snake?
CREATE TABLE "18_k_gold_proof_lunar_hologram_coin_seri" (
  "year" real,
  "theme" text,
  "artist" text,
  "composition" text,
  "mintage" real,
  "issue_price" text
);
SELECT "artist" FROM "18_k_gold_proof_lunar_hologram_coin_seri" WHERE "theme"='year of the snake';