Well the Fair Pay report is out. I've had a quick scan but will need to delve into it in a bit more detail. Though I am not particularly inclined to do so.
One of their findings was out of 148,600 Chief Executives, General Managers and Legislators (incidentally the largest group of workers) 28.59% earnt less than $20 an hour.
Edit.
This report requires some very serious Fact Checking. For example it says "We examined the demographics of those working on or near the minimum wage – under $20 perhour.". Current minimum wage is $16.50. $20 is over 20% more than this rate already.