Aggregate estimates for wildlife populations and species diversity on private land in Namibia were made for 1972 and 1992. Financial profitability was generally low with both livestock-game production for consumptive use and wildlife production for non-consumptive use. 

Barnes, Jonathan & Jager, J.. (1995). Economic and Financial Incentives for Wildlife Use on Private Land in Namibia and the Implications for Policy. S. Afr. J. Wildl. Res.. 26.