Nice! Bosnia doesn't have 3 B, maybe you can moved Philippines to the end of 2nd columns so the 3rd column starts with a new letter (like the 2nd column does)
I made a quick comparison with this quiz of mine - http://www.jetpunk.com/user-quizzes/91108/letters-a-to-z-which-country-has-the-most - St Kitts also has three S's