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Subject (Region)
- Europe4,613
- Europe, Eastern974
- United States476
- Europe, Central393
- European Union countries386
- Former Soviet republics140
- European Economic Community countries117
- Great Britain112
- Soviet Union98
- Russia (Federation)95
- Asia92
- Europe, Western76
- North America74
- Europe, Northern73
- Japan70
- Developing countries52
- Germany51
- Middle East51
- Latin America49
- Europe, Southern46