CREATE TABLE table_204_958 (id DECIMAL, "episode" DECIMAL, "original broadcast date" TEXT, "average" DECIMAL, "rank" DECIMAL, "remarks" TEXT)

which was the first episode to drop the average below 0.60 ?
SELECT MIN("episode") FROM table_204_958 WHERE "average" < 0.6
SELECT MIN("episode") FROM "table_204_958" WHERE "average" < 0.6