I would imagine that most CEOs work for companies that make less than $25m/year, so they aren't paid anywhere near $12m/year. I also bet quite a few CEOs of mega-companies, like Tim Cook of Apple and Nike, earn considerably more than $12m/year and this throws the data off by quite some way.
When the data is spread like that it becomes quite meaningless to use the average without some other information, like the distribution or deviation, to tell you more.
I haven't looked into this though, so I could be very wrong.







