Qua io ho trovato statistiche decisamente differenti (anche se la varie versioni dei browser sono accorpate):
www.w3schools.com/browsers/browsers_stats.asp
2011 IE |Firefox|Chrome|Safari|Opera
April 24.3% 42.9% 25.6% 4.1% 2.6%
March 25.8% 42.2% 25.0% 4.0% 2.5%
February 26.5% 42.4% 24.1% 4.1% 2.5%
January 26.6% 42.8% 23.8% 4.0% 2.5%