United States 41,877
Germany 2,915
Great Britain 2,622
Japan 2,329
Europe 2,259
Soviet Union 2,135
Russia (Federation) 2,067
China 2,061
India 1,757
Canada 1,684
France 1,487
Developing countries 1,287
California 1,181
Africa 1,176
Israel 1,174
Indonesia 1,147
Australia 1,088
Brazil 1,041
Latin America 972
Italy 890
Mexico 874
Germany (West) 819
Poland 673
Massachusetts 662
États-Unis 656
Thailand 649
Asia 647
Russia 644
États-Unis 609
New York (State) 606
Sweden 606
Philippines 538
European Union countries 523
Nigeria 514
South Africa 508
Netherlands 481
England 479
Antarctica 454
Colombia 442
Spain 441
Korea (South) 434
Austria 431
Vietnam 417
Cambridge 398
Arctic regions 394
North Carolina 387
Taiwan 383
Outer space 371
Argentina 363
Alaska 346
Pakistan 329
Switzerland 327
Illinois 318
Ukraine 310
Malaysia 304
Germany (East) 301
New Zealand 301
Europe, Eastern 289
Arab countries 288
Tropics 282
Egypt 278
Bulgaria 258
Turkey 258
Norway 257
Middle East 255
Southeast Asia 255
Pennsylvania 248
USA 247
Hungary 244
Southern States 244
Finland 241
Peru 236
Scandinavia 235
Bangladesh 232
Korea 225
Venezuela 216
New York 215
Arctic Regions 202
Greece 201
Denmark 200
Africa, Sub-Saharan 196
North America 196
Chile 194
European Economic Community countries 192
Florida 192
Maryland 190
Texas 188
Czechoslovakia 182
Ontario 180
Kenya 179
Belgium 173
Belarus 171
Bosnia and Herzegovina 170
Pacific Area 169
Czech Republic 168
Oregon 168
Caribbean Area 167
Iran 167
Colorado 165
Pacific Ocean 165