Looking the questions of this site, it seems that D&D, in all its versions and variants, is by far the most played game. But that's not quite true in the people I know, so I think the proportions in Europe and USA may be different.
Are there any real statistic about the most played games? I'm specially interested in per-country or at least per continent statistics.
Note: I don't know which tags would be appropriate. I accept suggestions in the form of comments.