To me i think there are some part of the world that still don't know anything about Bitcoin, because there are people in USA, UK, Australia, Canada, China,etc. even in Nigeria there are people that don't know anything about Bitcoin, they always think that Bitcoin is a scam, but people that know about it are making thousand of Dollars,($) I think they don't know that we are in a digital world now.
There is a little difference not know about Bitcoin at all and to only have a little knowledge about Bitcoin. Those that thinks that Bitcoin is a scam are people who have already knew about Bitcoin but they only have a slight knowledge about it and the slight knowledge they have is a misunderstanding of what Bitcoin really stands for.
Every country in the world know about Bitcoin, they do but not everyone in that country may know but most of them knows. Give it 100 years from today and more people will know about Bitcoin.