Way back in 2005 the GNOME “10×10 Goal” was formed to “own 10% of the global desktop market by 2010.” Now approaching ten years past that failed goal, GNOME or even the broader Linux desktop marketshare is still well off from seeing a 10% market-share.
That very ambitious 10×10 goal is still documented on the GNOME Wiki and is about “10% of the global desktop market.” Perhaps in some very select geographic regions, the Linux desktop marketshare may be close to 10%, but on any large scale that goal is still a pipe-dream.