調查日期  Date of Survey	成功樣本   Successful Sample	按次回應率   Response Rate
2-6/12/2002	1063	64.0%
13-21/9/2001	1025	60.5%
3-9/10/2000	1067	59.8%
30/9/1999	513	65.4%
3/10/1998	530	50.0%
2-3/9/1997	683	45.7%