| 1990 | 2000 | 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kenya | 7,404 | 424 | 3 | 6 | 29 | 2 | ||||||||||||
| Rwanda | 177 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 0 | 0 | 0 | 0 | |||
| Burundi | 529 | 72 | 0 | 0 | 0 | |||||||||||||
| Uganda | 913 | 0 | 382 | 0 | ||||||||||||||
| United Republic of Tanzania | 243 | 0 | 0 | 0 | 0 | 0 | ||||||||||||
| South Sudan | 0 | 3 | 0 | 77 | 0 | 52 |