人口變項
Demographic profile of respondents
10-13/8/2010
4-9/2/2010
11-16/8/2009
10-12/2/2009
11-14/8/2008
12-14/2/2008
20-24/8/2007
22-26/2/2007
21-23/8/2006
17-21/2/2006
25-29/10/2005
18-20/7/2005
18-21/4/2005
17-19/1/2005