Someone already mentioned it, especially today we have a lot of Linux-based operating systems therefore the name GNU or GNU/Linux become more and more important. Android, WebOS and GNU for example are all Linux-based operating system but it is a huge difference between running a GNU(/Linux) system or an Android(/Linux) system.
I don't want to bargaining about a few percentage because I think that's not the point like explained above. But I wonder which packages where count as GNU packages? If you look at this list you will see a lot of packages which at least I wouldn't think of in the first second (e.g. GNOME, Gtk+. Classpath,...).