This graph is a fail. It doesn't take in account the fact that there were more PC's in 2012 than in 2006.Percentage of PC's? Windows 8 has to compete against ALL Windows 7 & Vista copies? (0.6+ billion), while Windows 7 only had to compete against Vista (0.05 billion copies)?
Next time you try to prove something, compare sales rather than "percentage" in an unrelated time-frame.
Windows 8 is doing well, with over 40 million licenses sold since November.