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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 
  1-6/2007  6073   61.6% 
  7-12/2006  6077   58.1% 
  1-6/2006  6140   60.7% 
  7-12/2005  3042   62.0%