It is a good data if it is known but no one can. Even if there is no anonymity since it has gone global it wont be easy to estimate. There are some assumption of about 10 million bitcoiners as at last year, this year must have added a large sum in which am one. There are several bitcoin owners with different wallets, off-liners/ cold stored and lost bitcoin. knowledge of minimum number of owners might reduce the challenge with an estimated percentage growth over years
ahahaha, that is certainly true. All people in the world is surely going to be very difficult to do so, because in the bitcoin we didn't know anyone who uses it without them providing the information. Because if we use or count all purse or existing addres in the bitcoin can never ensure properly. that the use is 1 person and not the one who has a lot of addres. So, we can only guess how many. but certainly I am sure that in the future users will have more of the bitcoin now or 50% of the total population of the world is