Об успешности проекта свидетельствует статистика 2009 года: 21 800 посетителей из 20 регионов России и 15 стран ближнего и дальнего зарубежья.

Could you please translate this to English?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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In 2010 an impressive 25500 visitors from 15 countries and 20 regions of Russia attended the show.