- almost 90% of people have not heard of it.
I don't agree with this. We can say that 99% of people never used Bitcoin but at least 30% of them have heard about Bitcoin. Almost every person I ever tried to initiate discussion about Bitcoin has heard about Bitcoin, however perspective about Bitcoin differ from person to person. Most of the people whom I talked with either think that Bitcoin is some kind of quick return investment or banned by government. However, none of those are true. We have to blame these newspapers and media for spreading lies. But whatsoever is the case, I assume that 3 out of 10 people have heard or read about Bitcoin at least once in their lifetime.
In my case, I first read about Bitcoin in 2014 when one of the daily newspaper printed a news about American guy who lost few millions due to losing his private keys. However, I kind of ignored article back then and actually started using Bitcoin not before 2015.