@erichw1504 The wiki page @daemonelson linked to has its sources at the bottom. The statistics are calculated by internet usage, not computer owners.
“We believe that a definition must be as general and as simple as possible. For analyzing and comparing Internet users on a global scale, IWS adopts as its benchmark a broad definition and defines an Internet User as anyone currently in capacity to use the Internet. In our opinion, there are only two requirements for a person to be considered an Internet User:
(1) The person must have available access to an Internet connection point, and
(2) The person must have the basic knowledge required to use web technology.
That’s it. No need to make complex something that is really quite simple. In many Third World countries one same Internet connection may be shared by many individual users. Due to this reason, Internet users might outnumber the amount of Internet access subscribers and also outnumber the telephone lines available in each country.”