Rhanbarth
- New Zealand 17 canlyniadau
- United States 5 canlyniadau
- Australia 3 canlyniadau
- Developing countries 2 canlyniadau
- Europe 2 canlyniadau
- European Union countries 2 canlyniadau
- Great Britain 2 canlyniadau
- European Economic Community countries 1 canlyniadau
- India 1 canlyniadau
- Mathematical models 1 canlyniadau
- Sweden 1 canlyniadau