Using on chain data:

There are 12.6M Bitcoin addresses with more than 0.01 BTC. Approximately 20% are lost. That leaves us with 12.6M x 80% = 10M addresses with more than 0.01 BTC.

Some studies shows that each person have 10 addresses on average. That means 1M people have more than 0.1 BTC. That’s 0.01% of the human population.