調查日期 <br> Date of survey	18 - 29	30+	整體  <br>Overall
7-12/97	16.1%	18.6%	18.0%
1-6/98	22.2%	25.1%	24.2%
7-12/98	17.7%	20.6%	19.9%
1-6/99	15.1%	18.3%	17.5%
7-12/99	22.7%	24.0%	23.6%
1-6/00	17.5%	20.3%	19.0%
7-12/00	18.0%	22.5%	21.3%
1-6/01	21.3%	30.7%	28.3%
7-12/01	22.7%	29.9%	28.7%
1-6/02	25.8%	31.3%	30.4%
7-12/02	25.7%	32.5%	31.1%
1-6/03	25.5%	32.2%	30.7%
7-12/2003	26.4%	34.9%	32.5%
1-6/2004	27.8%	34.1%	33.0%
7-12/2004	19.5%	34.0%	31.6%
1-6/2005	29.3%	37.4%	36.4%
7-12/2005	21.7%	33.8%	30.7%
1-6/2006	30.5%	35.5%	34.6%
7-12/2006	30.7%	32.1%	31.8%
1-6/2007	21.0%	27.7%	26.4%
7-12/2007	20.0%	29.4%	27.2%
1-6/2008	29.0%	41.1%	38.6%
7-12/2008	23.2%	37.6%	34.4%
1-6/2009	22.7%	30.4%	29.3%
7-12/2009	18.0%	25.6%	24.2%
1-6/2010	21.6%	29.4%	27.8%
7-12/2010	16.1%	22.6%	21.1%
1-6/2011	11.3%	27.3%	23.5%
7-12/2011	11.8%	18.1%	16.6%
1-6/2012	8.0%	20.7%	18.2%
7-12/2012	5.1%	25.2%	21.4%
1-6/2013	8.7%	26.0%	22.8%
7-12/2013	7.1%	24.9%	21.5%
1-6/2014	3.6%	23.7%	19.5%
7-12/2014	6.5%	20.5%	17.8%	
1-6/2015	5.3%	25.4%	22.1%	
7-12/2015	7.6%	20.2%	18.0%