| Africa (Number) |
| South Africa | 15,788 in 2019 | WB |
| Egypt | 8,226 in 2019 | WB |
| Nigeria | 7,317 in 2019 | WB |
| Algeria | 6,720 in 2019 | WB |
| Morocco | 5,451 in 2019 | WB |
| United Republic of Tanzania | 3,427 in 2018 | WB |
| Kenya | 3,302 in 2019 | WB |
| Tunisia | 3,247 in 2017 | WB |
| Namibia | 2,800 in 2019 | WB |
| Ghana | 2,591 in 2018 | WB |
| Mozambique | 2,201 in 2019 | WB |
| Zimbabwe | 2,181 in 2019 | WB |
| Zambia | 1,957 in 2019 | WB |
| Sudan | 1,778 in 2019 | WB |
| Angola | 1,729 in 2019 | WB |
| Uganda | 1,506 in 2018 | WB |
| Botswana | 1,326 in 2019 | WB |
| Rwanda | 1,325 in 2019 | WB |
| Madagascar | 1,294 in 2019 | WB |
| Eswatini | 1,182 in 2015 | WB |
| Sierra Leone | 1,126 in 2019 | WB |
| Lesotho | 1,121 in 2018 | WB |
| Mauritius | 1,066 in 2019 | WB |
| Gambia | 947 in 2019 | WB |
| Malawi | 668 in 2016 | WB |
| Sao Tome and Principe | 606 in 2019 | WB |
| Seychelles | 540 in 2019 | WB |
| Ethiopia | 485 in 2018 | WB |
| Democratic Republic of the Congo | 397 in 1996 | WB |
| Liberia | 305 in 1993 | WB |
| Mauritania | 215 in 2017 | WB |
| Djibouti | 213 in 2013 | WB |
| Cabo Verde | 193 in 2019 | WB |
| Burundi | 132 in 2002 | WB |
| Somalia | 63 in 1984 | WB |
| Mali | 36 in 2010 | WB |
| Burkina Faso | 34 in 2010 | WB |
| Guinea | 20 in 1991 | WB |
| Guinea Bissau | 14 in 2013 | WB |
| Research and Development |
| Scientific and Technical Journal Articles | 1.7 Number in 2020 | WB |
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