Region
United States --
530
United States
520
China
33
China --
33
Soviet Union
30
Soviet Union --
30
United states --
28
Japan
27
Japan --
26
Europe
22
Europe --
20
Asia
18
Asia --
17
Middle East
14
Israel
11
Middle East --
11
East Asia
10
Great Britain
10
Israel --
10
Latin America
10
Latin America --
10
Great Britain --
8
Central America --
7
East Asia --
7
Asia, Southeastern
6
Asia, Southeastern --
6
Australia --
6
Developing countries
6
Developing countries --
6
Australia
5
Central America
5
Foreign countries
5
Iran --
5
Philippines --
5
Singapore
5
Singapore --
5
Vietnam
5
Canada
4
Caribbean Area
4
Caribbean Area --
4
Germany
4
Islamic countries
4
Islamic countries --
4
Laos
4
Malaysia
4
Malaysia --
4
Pacific area --
4
Panama --
4
Philippines
4
Russia (Federation)
4
more ...