The "growth" of Safari is not really growth of the desktop browser's market share but the addition of Safari Mobile market share, which wasn't included in previous market share stats together with the desktop Safari.
"Among other browsers, only Safari has been able to grow over the past year, creeping up roughly 2.6%, largely on the strength of growth in iOS devices."
The full article from a few days ago:
http://www.zdnet.com/blog/bott/google-chrome-continues-its-r...