調查日期 <br> Date of survey	18 - 29	30+	整體  <br>Overall
7-12/97	67.6%	56.2%	59.5%
1-6/98	60.9%	50.6%	53.3%
7-12/98	66.6%	55.9%	58.9%
1-6/99	71.7%	60.0%	63.4%
7-12/99	64.1%	53.4%	56.1%
1-6/00	70.5%	56.3%	60.0%
7-12/00	66.6%	57.5%	59.3%
1-6/01	65.8%	50.4%	53.8%
7-12/01	64.9%	50.2%	53.2%
1-6/02	61.2%	47.8%	50.6%
7-12/02	62.8%	48.6%	51.7%
1-6/03	64.0%	49.7%	53.4%
7-12/2003	59.8%	44.5%	48.3%
1-6/2004	58.7%	46.1%	49.2%
7-12/2004	67.5%	44.5%	49.0%
1-6/2005	61.3%	41.1%	45.2%
7-12/2005	64.5%	47.1%	51.3%
1-6/2006	58.2%	48.0%	49.9%
7-12/2006	60.6%	43.5%	46.8%
1-6/2007	65.7%	53.0%	55.2%
7-12/2007	69.1%	51.1%	54.9%
1-6/2008	58.3%	44.6%	47.3%
7-12/2008	66.3%	47.3%	51.4%
1-6/2009	71.2%	53.7%	56.7%
7-12/2009	73.5%	58.8%	61.5%
1-6/2010	66.2%	54.0%	56.5%
7-12/2010	75.1%	59.9%	63.1%
1-6/2011	81.9%	59.7%	65.2%
7-12/2011	75.2%	59.2%	62.9%
1-6/2012	84.9%	64.2%	68.2%
7-12/2012	85.0%	54.3%	60.1%
1-6/2013	84.3%	57.6%	62.6%
7-12/2013	87.6%	56.8%	62.6%
1-6/2014	86.7%	62.3%	67.3%
7-12/2014	81.6%	62.9%	66.5%	
1-6/2015	87.0%	59.2%	63.8%	
7-12/2015	86.2%	63.9%	67.7%