Ámbito geográfico
ARGENTINA
14
LATIN AMERICA
11
SOVIET UNION
8
UNITED STATES
7
DEVELOPING COUNTRIES
4
GREAT BRITAIN
3
CHINA
2
COLOMBIA
2
EUROPE
2
FRANCE
2
AMÉRICA LATINA
1
BRASIL
1
BRAZIL
1
BRITISH COLUMBIA
1
CANADA
1
CENTRAL AMERICA
1
COSTA RICA
1
INDIA
1
ITALY
1
MEXICO
1
NICARAGUA
1
RUSSIA (FEDERATION)
1
UNIÓN SOVIÉTICA
1