| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
|---|---|---|---|---|
| Botswana | February 6, 1985 | |||
| Cabo Verde | July 14, 2022 | |||
| Eswatini | December 17, 1987 | |||
| Gambia | February 15, 1978 | |||
| Ghana | February 15, 1978 | |||
| Kenya | February 15, 1978 | |||
| Lesotho | July 23, 1987 | |||
| Liberia | December 24, 2009 | |||
| Malawi | February 15, 1978 | |||
| Mauritius | September 25, 2020 | |||
| Mozambique | February 8, 2000 | |||
| Namibia | October 14, 2003 | |||
| Rwanda | June 24, 2011 | |||
| Sao Tome and Principe | May 19, 2014 | |||
| Seychelles | October 1, 2021 | |||
| Sierra Leone | December 5, 1980 | |||
| Somalia | December 10, 1981 | |||
| Sudan | May 2, 1978 | |||
| Uganda | August 8, 1978 | |||
| United Republic of Tanzania | October 12, 1983 | |||
| Zambia | February 15, 1978 | |||
| Zimbabwe | November 11, 1980 |