CREATE TABLE table_204_168 (id DECIMAL, "date" TEXT, "time" TEXT, "opponent" TEXT, "site" TEXT, "tv" TEXT, "result" TEXT, "attendance" DECIMAL, "record" TEXT)

how much larger was the attendance on 11/25/2013 than 12/21/2013 ?
SELECT (SELECT "attendance" FROM table_204_168 WHERE "date" = '11/25/2013') - (SELECT "attendance" FROM table_204_168 WHERE "date" = '12/21/2013')
SELECT (SELECT "attendance" FROM "table_204_168" WHERE "date" = '11/25/2013') - (SELECT "attendance" FROM "table_204_168" WHERE "date" = '12/21/2013')