CREATE TABLE table_204_438 (id DECIMAL, "year" DECIMAL, "title" TEXT, "album" TEXT, "us r&b" DECIMAL, "us pop" DECIMAL, "us dance" DECIMAL)

which years did the album changes not make it on the us dance list ?
SELECT "year" FROM table_204_438 WHERE "album" = 'changes' AND "us dance" IS NULL
SELECT "year" FROM "table_204_438" WHERE "album" = 'changes' AND "us dance" IS NULL