調查月份  Month of Survey	半年結調查次數   Number of Surveys  (Half-yearly)	半年結成功樣本   Successful Sample  (Half-yearly)	半年結回應率   Response Rate  (Half-yearly Average)
7/02-12/02	2	2096	65.4%
1/02-6/02	2	2063	64.6%
7/01-12/01	2	2102	71.0%
1/01-6/01	2	2128	63.4%
7/00-12/00	2	2125	56.6%
1/00-6/00	4	2631	53.9%
7/99-12/99	3	1646	48.4%
1/99-6/99	3	1590	49.3%
7/98-12/98	3	1550	47.2%
1/98-6/98	2	1047	47.0%
7/97-12/97	2	1087	43.5%