Breakdown by Continent
| Continent | Yes | No | No data | Countries researched |
|---|---|---|---|---|
| Africa | 12 (23.5%) |
36 (70.6%) |
3 (5.9%) |
51 |
| Americas | 9 (26.5%) |
23 (67.6%) |
2 (5.9%) |
34 |
| Asia | 9 (24.3%) |
28 (75.7%) |
0 (0.0%) |
37 |
| Europe | 19 (43.2%) |
25 (56.8%) |
0 (0.0%) |
44 |
| Oceania | 1 (7.1%) |
12 (85.7%) |
1 (7.1%) |
14 |
| Total | 50 | 124 | 6 | 180 |
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