I don't know, but half of them are below average by definition.

Take a scan down the Fortune 500 and put a star next to each one you think has had 'exemplary leadership' rather than 'competent administration' or 're-arranging deck chairs while the titanic burns'.

The CEO of eBay got busted sending bloody pig masks to people who left bad reviews on the internet, for god's sake. These people aren't a higher plane of being.