Region
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New York (State)
1
Nigeria
6
North America
2
North Macedonia
1
Northern Mariana Islands
1
Norway
3
OECD countries
7
Pacific Area
12
Panama
2
Papua New Guinea
1
Pa⩳es subdesarrollados
2
Persian Gulf Region
1
Persian Gulf States
2
Peru
3
Philippines
2
Poland
7
Romania
2
Russia
1
Russia (Federation)
15
Rwanda
3
Saint Petersburg
1
Saint Petersburg (Russia)
1
Saudi Arabia
8
Serbia
1
Shen-chen Special Economic Zone (Shen-chen shih, China)
1
Sierra Leone
1
Singapore
3
Slovakia
1
Slovenia
2
South Africa
5
South America
2
South Asia
3
Southeast Asia
16
Soviet Union
3
Spain
1
Sri Lanka
1
Sudan
4
Switzerland
2
Taiwan
6
Thailand
3
Trinidad and Tobago
2
Tunisia
3
Turkey
2
Ukraine
3
United States
641
Venezuela
1
Vietnam
6
West (U.S.)
1
West Indies
1
Zambia
1
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