Region
Europe, Eastern --
Europe, Eastern
19
Former Soviet republics
4
Former Soviet republics --
4
Russia (Federation) --
3
China --
2
Poland --
2
Russia (Federation)
2
China
1
Developing countries --
1
East Asia
1
East Asia --
1
Europe, Central
1
Europe, Central --
1
Poland
1
Soviet Union
1
Soviet Union --
1
Vietnam --
1