| Value | Category |
|---|---|
| 1 | 1. South Africa |
| 2 | 2. Germany |
| 3 | 3. Greece |
| 4 | 4. Israel |
| 5 | 5. Latvia |
| 6 | 6. Lithuania |
| 7 | 7. Poland |
| 8 | 8. Russian Federation |
| 9 | 9. Ukraine |
| 10 | 10. United Kingdom |
| 11 | 11. United States |
| 12 | 12. Zambia |
| 13 | 13. Zimbabwe |
| 14 | 14. Other country |
| 15 | 15. Prefer not to say |