| Decade | Male | Female | Unknown |
|---|---|---|---|
| 48.76 | 40.82 | 10.42 | |
| Bamana | 88.25 | 11.32 | 0.43 |
| Calabar | 45.36 | 30.41 | 24.23 |
| Congo | 69.03 | 30.9 | 0.07 |
| Edo | 55.88 | 41.18 | 2.94 |
| Fon/Arada | 51.43 | 47.76 | 0.82 |
| Hausa | 90.37 | 8.15 | 1.48 |
| Ibibio/Moko | 72.62 | 25 | 2.38 |
| Igbo | 54.36 | 44.89 | 0.76 |
| Kanga | 61.76 | 37.94 | 0.29 |
| Kisi | 58.62 | 40.23 | 1.15 |
| Konkomba | 66.35 | 33.41 | 0.24 |
| Makwa | 65.69 | 34.31 | 0 |
| Mandinga | 66.92 | 33.08 | 0 |
| Mina | 68.47 | 31.53 | 0 |
| Nago/Yoruba | 68.99 | 31.01 | 0 |
| Nar/Moor | 74.26 | 25.74 | 0 |
| Poulard/Fulbe | 76.19 | 23.81 | 0 |
| Senegal/Wolof | 60.8 | 39.2 | 0 |
| Unknown | 50 | 50 | 0 |