/cn/common/service.jsp?category=ROOT%3E%D6%D0%D0%D0%D7%DC%D0%D0%3E%D0%D0%C7%E9%B7%D6%CE%F6%CA%D2%3E%D6%D0%D0%D0%BB%E3%C6%C0%3E%CD%E2%BB%E3%C5%C6%BC%DB&querytype=bydate&t_oneday=2006%2F12%2F31&b_bydate=%B0%B4%C8%D5%C6%DA%B2%E9%D1%AF
點開上面這個網頁，在最下面按日期查詢，就能查到某年某月某日的外匯款牌價了。