CREATE TABLE table_203_710 (id DECIMAL, "genre" TEXT, "year" DECIMAL, "title" TEXT, "episode" TEXT, "role" TEXT, "notes" TEXT)

what year what his busiest year with the most roles ?
SELECT "year" FROM table_203_710 GROUP BY "year" ORDER BY COUNT("role") DESC LIMIT 1
SELECT "year" FROM "table_203_710" GROUP BY "year" ORDER BY COUNT("role") DESC NULLS LAST LIMIT 1