Lol.. this look quite ridiculous. Do you want to say that the Bitcoin adoption in the United States is lower than the world wide average? And even more ridiculous is the figure for Japan, which is regarded by many as the country with the maximum Bitcoin penetration. I don't know much about South Africa, but to say that countries like Nigeria and Ghana have more Bitcoin users (in %) compared to US and Japan is pure BS.
Why are you surprised? There are more barriers to dealing with cryptocurrencies in the US than elsewhere. A lot of the countries higher up the list have citizens suffering from problems such as high inflation or capital controls so I'm not surprised they score higher. Another thing worth mentioning is the prevalence of various ponzi schemes based on cryptocurrencies in certain African countries.