The idea of knowing what country is "the best" interested me for a long time, so I've took the time and counted all winners from Top5 for rounds 11-54 (supposing nobody will be banned in this round's top5), because before round 5, there are no flags shown in Winners page.

Looks like the winner is Poland, followed by Brazil and Romania. Special case is fourth entry - Czech+Slovak counted together, as we have one forum section here together, use one square together, Czechs and Slovaks are usually helping each other (teams) and our languages are pretty much similar. In case you would not like this, I included original counts for separate countries as well, with Slovakia having 2.5x higher score (mostly thanks to Olympic 5 wins).

1st place for 5 points, 2nd for 4 points, 3rd for 3 points, 4th for 2 points and fifth place for 1 point.