Here is a breakdown of the nationalities of these mountaineers:
1. South Africa: 8
2. Zimbabwe: 3
3. United States: 2
4. Kenya: 2
5. Ethiopia: 1
6. Tanzania: 1
7. Nigeria: 1
8. Jamaica: 1
9. Trinidad and Tobago: 1
It's important to note that these statistics may not be entirely up-to-date, as there may have been additional successful summits by black mountaineers since May 2023. For the most current information, it's best to refer to the official records of the Himalayan Database.