Region
Soviet Union
1,076
China
645
Communist countries
235
Europe, Eastern
161
United States
120
Russia
96
Russia (Federation)
82
Germany (East)
77
Developing countries
74
Yugoslavia
72
Poland
64
Eastern Europe
63
Japan
60
Latin America
53
Germany
52
Cuba
46
Czechoslovakia
39
Bulgaria
38
Great Britain
37
Hungary
34
Europe
33
Vietnam
32
France
30
India
27
Germany (West)
26
Italy
26
Asia
19
Korea (South)
19
Ukraine
19
Africa
15
Brazil
15
Chine
15
URSS
14
Greece
13
Egypt
12
Mexico
12
Korea (North)
11
Russie
11
Arab countries
10
Spain
10
Chile
9
East Asia
9
Kazakhstan
8
Romania
8
South Africa
8
Turkey
8
Austria
7
Europe de l'Est
7
Siberia (Russia)
7
Africa, Sub-Saharan
6
more ...