Subject
- Heisei period14
- Military policy13
- Political activity13
- Security, International13
- Social aspects13
- Intellectual life12
- Presidents12
- Democratization11
- Ethnic relations11
- Influence11
- Social policy11
- Civilization10
- International economic relations10
- Japanese literature10
- Political science10
- Relations10
- Economics9
- Foreign economic relations9
- History, Modern9
- Philosophy9