調查日期 <br> Date of survey	18 - 29	30+	整體  <br>Overall
26-27/8/1997	15.2%	21.9%	20.1%
23-24/9/1997	17.4%	21.3%	20.3%
28-29/10/1997	13.0%	23.2%	20.1%
8-9/12/1997	14.8%	22.4%	18.9%
3-4/6/1998	14.3%	20.6%	18.7%
22-24/6/1998	16.4%	16.4%	16.4%
14/8/1998	17.8%	20.6%	19.8%
29/9/1998	12.3%	17.0%	15.6%
21/12/1998	6.8%	18.7%	15.1%
8-9/2/1999	11.1%	17.8%	15.3%
15/4/1999	13.2%	13.8%	13.1%
8/6/1999	6.5%	13.4%	11.2%
6/8/1999	13.2%	18.0%	17.5%
26-27/10/1999	13.7%	16.4%	16.2%
13-15/12/1999	11.3%	21.0%	17.2%
1-2/2/2000	10.3%	22.6%	19.5%
6-7/4/2000	10.4%	14.5%	14.2%
7-8/6/2000	10.2%	15.5%	14.0%
21-25/9/2000	11.7%	14.4%	14.5%
4-12/12/2000	10.5%	16.1%	13.8%
22/3-2/4/2001	12.7%	17.2%	16.0%
1-5/6/2001	9.0%	14.7%	13.3%
13-21/9/2001	13.1%	19.8%	17.6%
7-9/12/2001	8.6%	11.2%	10.4%
12-13/3/2002	11.3%	20.3%	17.9%
4-5/6/2002	11.1%	13.5%	13.0%
2-5/9/2002	10.2%	16.7%	15.0%
13-18/12/2002	11.6%	15.3%	14.3%
1-4/3/2003	11.0%	17.0%	15.0%
13-18/6/2003	8.5%	13.4%	11.9%
10-14/12/2003	12.8%	16.9%	15.6%
7-11/6/2004	11.3%	16.2%	14.3%
6-9/12/2004	13.1%	17.4%	16.2%
6-8/6/2005	8.4%	17.9%	14.7%
9-14/12/2005	13.5%	18.1%	16.9%
13-15/6/2006	10.2%	16.1%	14.9%
6-12/12/2006	8.3%	22.8%	20.1%
8-12/6/2007	12.1%	17.5%	16.7%
11-14/12/2007	9.6%	17.8%	16.0%
11-13/6/2008	12.2%	13.4%	13.3%
9-12/12/2008	9.3%	14.0%	13.0%
8-13/6/2009	6.2%	15.1%	13.3%
8-11/12/2009	7.6%	14.3%	13.1%
9-13/6/2010	11.7%	15.5%	14.8%
13-16/12/2010	7.5%	15.5%	13.8%
21-22/6/2011	4.5%	12.4%	10.3%
12-20/12/2011	8.8%	20.7%	17.8%
13-20/6/2012	5.9%	13.1%	11.7%
14-17/12/2012	8.2%	18.1%	16.2%
10-13/6/2013	6.0%	13.4%	12.0%
9-12/12/2013	4.7%	17.4%	15.0%
6-12/6/2014	9.7%	12.2%	11.6%
10-16/12/2014	11.0%	16.0%	15.0%	
15-18/6/2015	7.7%	14.2%	13.1%	
3-7/12/2015	5.6%	14.7%	13.2%