When I started using the WWW in 01992 the majority of Web users were probably using text-based browsers, and specifically Lynx, because that was what the University of Kansas was using for its campuswide information service (CWIS). Mosaic didn't exist yet, and most people accessing the internet were using either dumb terminals like I was (typically in my case a VT-100 or CIT-101 clone of it) or dialup terminal emulators like Procomm+.
I wouldn't be surprised if it's growing in absolute numbers, in relative numbers it stays at essentially 0% where it always was.