| Country | Years Affected | Nearest (0.1 mn) |
| Kenya | 2008 | 1.4 |
| 2005-06 | 3.5 | |
| 2004 | 2.3 | |
| 1999-02 | 23.0 | |
| 1997-98 | 1.6 | |
| 1994-95 | 1.2 | |
| 1991-92 | 2.7 | |
| Ethiopia | 2008 | 6.4 |
| 2003-04 | 12.6 | |
| 1997 | 1.0 | |
| 1989-94 | 6.5 | |
| 1987 | 7.0 | |
| 1983-84 | 7.8 | |
| Sudan | 2000-01 | 2.0 |
| 1991-92 | 8.6 | |
| 1987 | 3.5 | |
| 1983-85 | 8.4 | |
| Eritrea | 2008 | 1.7 |
| 1999-03 | 2.3 | |
| 1993 | 1.6 | |
| Somalia | 2008 | 3.3 |
| 2000-01 | 1.2 | |
| 1987 | 0.5 |