Such info isn't at all hard to find. It's a quick google away. It is also common knowledge that heterosexual transmission is high in some parts of Africa.

Here's a couple of pieces I found in short order:

https://www.jwatch.org/jw199110040000006/1991/10/04/heterose...

https://www.ncbi.nlm.nih.gov/pubmed/8420583

Try google. This information is easily available.