調查日期 <br> Date of survey	18 - 29	30+	整體  <br>Overall
7-12/1997	21.9%	24.3%	23.6%
1-6/1998	18.7%	18.7%	18.5%
7-12/1998	20.2%	25.1%	23.6%
1-6/1999	22.2%	21.9%	22.0%
7-12/1999	19.5%	24.3%	22.6%
1-6/2000	22.3%	22.8%	22.5%
7-12/2000	21.0%	23.6%	23.0%
1-6/2001	20.7%	19.6%	20.0%
7-12/2001	23.0%	25.0%	24.2%
1-6/2002	18.9%	21.3%	20.7%
7-12/2002	23.3%	21.6%	21.7%
1-6/2003	19.5%	20.8%	20.8%
7-12/2003	27.8%	22.2%	23.4%
1-6/2004	22.8%	20.6%	21.2%
7-12/2004	25.5%	23.5%	23.1%
1-6/2005	18.6%	21.6%	21.2%
7-12/2005	26.1%	26.5%	26.5%
1-6/2006	23.1%	25.6%	25.1%
7-12/2006	28.3%	23.2%	24.3%
1-6/2007	29.6%	32.6%	31.8%
7-12/2007	39.5%	29.6%	31.5%
1-6/2008	35.4%	28.0%	29.2%
7-12/2008	28.8%	29.5%	29.6%
1-6/2009	35.6%	31.3%	32.0%
7-12/2009	27.4%	23.2%	23.9%
1-6/2010	30.4%	31.6%	31.3%
7-12/2010	29.5%	27.5%	27.6%
1-6/2011	25.1%	19.9%	21.3%
7-12/2011	32.7%	22.9%	25.3%
1-6/2012	15.6%	24.5%	22.7%
7-12/2012	41.0%	30.9%	32.8%
1-6/2013	28.5%	23.3%	24.3%
7-12/2013	28.5%	27.5%	27.6%
1-6/2014	33.5%	24.8%	27.1%
7-12/2014	21.8%	25.0%	24.4%	
1-6/2015	24.0%	27.9%	27.3%	
7-12/2015	30.6%	26.8%	27.5%