United States 41,854
Germany 2,912
Great Britain 2,619
Japan 2,323
Europe 2,260
Soviet Union 2,131
Russia (Federation) 2,062
China 2,056
India 1,756
Canada 1,681
France 1,485
Developing countries 1,284
California 1,180
Africa 1,176
Israel 1,174
Indonesia 1,146
Australia 1,085
Brazil 1,040
Latin America 969
Italy 888
Mexico 874
Germany (West) 819
Poland 672
Massachusetts 662
Thailand 649
Asia 646
Russia 644
États-Unis 642
États-Unis 607
New York (State) 605
Sweden 605
Philippines 537
European Union countries 523
Nigeria 514
South Africa 509
Netherlands 480
England 477
Antarctica 454
Colombia 441
Spain 439
Austria 432
Korea (South) 430
Vietnam 416
Cambridge 398
Arctic regions 394
North Carolina 387
Taiwan 383
Outer space 371
Argentina 362
Alaska 346
Pakistan 329
Switzerland 327
Illinois 318
Ukraine 310
Malaysia 302
Germany (East) 301
New Zealand 300
Europe, Eastern 289
Arab countries 287
Tropics 282
Egypt 278
Bulgaria 258
Norway 257
Turkey 257
Middle East 255
Southeast Asia 255
Pennsylvania 248
USA 247
Hungary 244
Southern States 244
Finland 241
Peru 236
Scandinavia 233
Bangladesh 232
Korea 224
New York 216
Venezuela 216
Arctic Regions 202
Denmark 199
Greece 199
North America 196
Africa, Sub-Saharan 195
Chile 194
European Economic Community countries 192
Florida 192
Maryland 190
Texas 188
Czechoslovakia 182
Ontario 180
Kenya 179
Belgium 173
Belarus 171
Pacific Area 169
Czech Republic 168
Iran 168
Oregon 168
Caribbean Area 167
Colorado 165
Pacific Ocean 165
United Kingdom 163