調查日期  Date of Survey	成功樣本   Successful Sample	回應率   Response Rate
8-9/1/2003	1259	68.9%
10/10/2001	1051	66.0%
11/10/2000	1059	69.7%
6/10/1999	888	54.5%
7/10/1998	1494	56.5%
8/10/1997	1482	62.9%