CREATE TABLE table_204_668 (id DECIMAL, "#" DECIMAL, "menteri besar" TEXT, "took office" TEXT, "left office" TEXT, "party" TEXT)

what was the date the last person on the list left office ?
SELECT "left office" FROM table_204_668 ORDER BY id DESC LIMIT 1
SELECT "left office" FROM "table_204_668" ORDER BY "id" DESC NULLS LAST LIMIT 1