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  調查日期
Date of survey		   調查次數
Number of Surveys  		  樣本人數
Total sample 		  回應率
Response rate 
  *7-12/2005  2   2030   63.1% 
  *1-6/2005  2   2046   63.9% 
  *7-12/2004  2   2042   62.7% 
  *1-6/2004  2   2027   65.8% 
  *7-12/2003  3   3110   66.8% 
* 認知率不足五成者評分不能作準
Ratings with less than 50% recognition rates are not taken as representative