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Publications according to years and top countries
| Total | 2010–2014 | 2005–2009 | 2000–2004 | 1995–1999 | < 1995 | |
|---|---|---|---|---|---|---|
| Nigeria | 56 | 16a | 16 | 8 | 1 | 15 |
| South Africa | 42 | 3 | 6 | 9 | 8 | 16 |
| Egypt | 33 | 15 | 10 | 3 | 3 | 2 |
| Morocco | 23 | 13 | 2 | 7 | 1 | |
| Tunisia | 17 | 4 | 7 | 4 | 2 |
Countries with the highest numbers indicated in italics.
