Region
China
31
United States
29
Soviet Union
16
Europe, Eastern
12
Japan
12
Russia (Federation)
11
Europe
5
Former Soviet republics
5
Developing countries
3
Russia
3
Taiwan
3
Asia
2
Chine
2
Communist countries
2
Europe, Central
2
European Economic Community countries
2
Germany (East)
2
Hungary
2
Latin America
2
Poland
2
America
1
Asia, Southeastern
1
Austria
1
Balkan Peninsula
1
Bosnia and Hercegovina
1
Czechoslovakia
1
East Asia
1
Eurasia
1
Former Soviet Republics
1
Former communist countries
1
Korea
1
Korea (South)
1
Kwangsi Chuang Autonomous Region (China)
1
Lu-kang chen
1
Mexico
1
Moscow
1
Nanjing (Jiangsu Sheng, China)
1
Pacific Area
1
Shandong Sheng (China)
1
Sweden
1
Turkey
1