| REGION | 1990 | 1995 | 2000 | 2005 | 2010 | 2015 | 2020 | 2025 |
| AFRICA | 33.9 | 37.3 | 40.7 | 44.0 | 47.4 | 50.7 | 53.9 | 57.1 |
| EASTERN AFRICA | 21.8 | 25.4 | 29.0 | 32.5 | 36.0 | 39.6 | 43.2 | 46.8 |
| MIDDLE AFRICA | 37.8 | 41.6 | 45.6 | 49.5 | 53.4 | 57.0 | 60.4 | 63.6 |
| WESTERN | 44.6 | 47.9 | 51.2 | 54.5 | 57.7 | 60.7 | 63.6 | 66.3 |
| AFRICA |
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| SOUTHERN AFRICA | 54.9 | 58.2 | 61.3 | 64.2 | 66.8 | 69.3 | 71.6 | 73.8 |
| WESTERN AFRICA | 32.5 | 36.1 | 29.8 | 43.6 | 47.3 | 51.0 | 54.6 | 58.0 |