I'm sure you know that a lot of NI people have Irish family so are more likely to choose that.
Although I seriously think those figures are skewed.

Now, I know Wikipedia isn't a great source, but according to a survey mentioned there: 57% of Protestants described themselves as British, while 32% identified as Northern Irish, 6% as Ulster and 4% as Irish. Compared to a similar survey carried out in 1998, this shows a fall in the percentage of Protestants identifying as British and Ulster, and a rise in those identifying as Northern Irish. The 2008 survey found that 61% of Catholics described themselves as Irish, with 25% identifying as Northern Irish, 8% as British and 1% as Ulster.

So there should be a higher number of UK/NI flags appearing unless there's a load of people who don't belong to either community/mostly Catholics voting (as Irish).

According to this wiki page: http://en.wikipedia.org/wiki/Demogra...cal_demography
there are slightly more Catholics (although the last survey/check was 2001) but it still doesn't make sense for there to be so many more Irish flags.

Personally, I regard myself as British/Northern Irish. I mean, I feel no particular affiliation to NI any more so than I feel an affiliation with the rest of the UK.