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Country 1987-1992 1993-1996 1997-2000 2001-2007 2008-…
Armenia x
Austria x x x x x
Bosnia & Herzegovina x x x
Bulgaria x x x x x
Croatia x x x x
Czech Republic x x x x x
Georgia x x x x
Germany x
Greece x x x
Hungary x x x x x
Italy x x
Lithuania x x x
Poland x x x x x
Romania x x x x x
Russian Federation x x x x
Serbia x
Slovakia x x x x
Slovenia x x x x
Turkey x x x x x
Yugoslavia x
TOTAL COUNTRIES 11 12 15 16 16