United States 41,890
Germany 2,918
Great Britain 2,624
Japan 2,330
Europe 2,260
Soviet Union 2,137
Russia (Federation) 2,078
China 2,066
India 1,758
Canada 1,685
France 1,487
Developing countries 1,287
California 1,182
Africa 1,178
Israel 1,175
Indonesia 1,150
Australia 1,093
Brazil 1,041
Latin America 972
Italy 891
Mexico 875
Germany (West) 820
Poland 676
Massachusetts 664
États-Unis 663
Asia 649
Thailand 649
Russia 644
États-Unis 610
New York (State) 607
Sweden 606
Philippines 539
European Union countries 523
Nigeria 515
South Africa 508
Netherlands 480
England 479
Antarctica 454
Colombia 443
Spain 441
Korea (South) 435
Austria 433
Vietnam 418
Cambridge 399
Arctic regions 396
North Carolina 387
Taiwan 383
Outer space 371
Argentina 364
Alaska 346
Pakistan 330
Switzerland 327
Illinois 318
Ukraine 311
Malaysia 304
Germany (East) 301
New Zealand 300
Europe, Eastern 290
Arab countries 288
Tropics 282
Egypt 279
Bulgaria 262
Turkey 259
Norway 257
Southeast Asia 256
Middle East 255
Pennsylvania 248
Hungary 244
Southern States 244
Finland 241
Peru 236
Scandinavia 235
Bangladesh 233
USA 233
Korea 224
Venezuela 217
New York 216
Arctic Regions 202
Greece 202
Denmark 200
Africa, Sub-Saharan 196
North America 196
Chile 195
European Economic Community countries 192
Florida 192
Maryland 190
Texas 188
Czechoslovakia 183
Ontario 181
Kenya 179
Belgium 173
Belarus 171
Bosnia and Herzegovina 170
Russie 170
Pacific Area 169
Czech Republic 168
Oregon 168
Caribbean Area 167
Iran 167
Pacific Ocean 165