Slate did a story a few years back, and others have done similar ones, that essentially show that surveys like this one are essentially worthless. In the US less than 10% will respond. The number goes up if people are offered something free for taking the survey. The results of the survey swing wildly depending on what time of day the pollster calls. Pew, also in the US, did a survey as part of a program to check how accurate they were, where they selected several thousand people, randomly split the group into two, then asked the people essentially the same question but worded  differently and got different results. The result was that pollsters can get any result they or their clients want.