調查日期  Date of Survey	成功樣本   Successful Sample	回應率   Response Rate
7/1/04	1040	67.5%
8-9/1/03	1259	68.9%
10/10/01	1051	66.0%
11/10/00	1059	69.7%
6/10/99	888	54.5%
7/10/98	1494	56.5%
8/10/97	1482	62.9%