調查日期 <br> Date of survey	18 - 29	30+	整體  <br>Overall
7-12/97	31.2%	40.8%	37.8%
1-6/98	37.3%	45.7%	43.2%
7-12/98	30.0%	40.2%	37.3%
1-6/99	25.3%	33.3%	30.7%
7-12/99	35.4%	42.5%	40.5%
1-6/00	27.8%	37.9%	34.9%
7-12/00	29.1%	37.8%	35.5%
1-6/01	32.2%	46.6%	43.0%
7-12/01	33.6%	45.4%	42.7%
1-6/02	37.0%	48.1%	45.9%
7-12/02	36.6%	48.5%	45.8%
1-6/03	35.2%	47.3%	44.1%
7-12/2003	39.2%	51.8%	48.1%
1-6/2004	39.0%	50.3%	47.3%
7-12/2004	32.5%	51.4%	47.8%
1-6/2005	37.7%	55.3%	51.1%
7-12/2005	35.1%	51.9%	47.6%
1-6/2006	40.6%	51.6%	49.4%
7-12/2006	39.0%	54.9%	51.9%
1-6/2007	33.2%	45.2%	43.1%
7-12/2007	29.6%	47.2%	43.2%
1-6/2008	41.2%	54.5%	51.9%
7-12/2008	32.5%	51.6%	47.4%
1-6/2009	28.8%	45.5%	42.7%
7-12/2009	25.5%	39.9%	37.3%
1-6/2010	33.3%	44.9%	42.5%
7-12/2010	23.6%	38.1%	35.0%
1-6/2011	15.8%	39.6%	33.8%
7-12/2011	20.5%	38.8%	34.4%
1-6/2012	13.8%	33.8%	29.9%
7-12/2012	13.3%	43.3%	37.6%
1-6/2013	14.6%	39.4%	34.8%
7-12/2013	11.8%	42.2%	36.5%
1-6/2014	13.3%	35.8%	31.1%
7-12/2014	17.5%	36.5%	32.9%	
1-6/2015	13.0%	39.6%	35.2%	
7-12/2015	13.3%	34.9%	31.2%