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  調查日期
Date of survey		  半年結樣本人數
Total Sample
(Half-yearly Average)  		  回應率
Response rate 
  7-12/2003  1046   66.3% 
  1-6/2003  8306   68.7% 
  7-12/2002  6230   65.7% 
  1-6/2002  9595   63.3% 
  7-12/2001  2108   72.8% 
  1-6/2001  2581   64.9%