Breakdown by Continent
| Continent | Yes | No | No data | Countries researched |
|---|---|---|---|---|
| Africa | 11 (21.6%) |
37 (72.5%) |
3 (5.9%) |
51 |
| Americas | 10 (29.4%) |
22 (64.7%) |
2 (5.9%) |
34 |
| Asia | 6 (16.2%) |
31 (83.8%) |
0 (0.0%) |
37 |
| Europe | 18 (40.9%) |
26 (59.1%) |
0 (0.0%) |
44 |
| Oceania | 1 (7.1%) |
12 (85.7%) |
1 (7.1%) |
14 |
| Total | 46 | 128 | 6 | 180 |
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