Growth of GNU/Linux on the Desktop
One picture says 1K words but some provisos need to be added. The absolute numbers here mean nothing except share on the one site. The changes in the numbers are what is important here. It is quite reasonable to assume the changes in share to one site reflect something of the popularity of OS in the general population insofar as visitors to W3Schools.com are a sample of the universe of users of the web.
What is clear is that GNU/Linux share is growing steadily while that other OS is shrinking. In the last year that other OS lost 2% share, -2.5% decline, while GNU/Linux gained 0.4% share, about +10% growth per annum.