It's implied that most human beings are cyborg in some level, but the real cyborg population is never addressed. Togusa, for instance, has minimal implants directly in his brain. Also, note that the Puppetmaster manipulated the garbage guy's mind, showing that even someone of such bad salary has some kind of cybernetic implant. On the other hand, the Major is strongly implied as barely human, since only a few parts of her brain remain fully biological, while everything else on her body is machinery, property of Section 9.