Percentage of Past President's cabinet who worked in Private sector

The percentage of each past president's cabinet who had worked
in the private business sector prior to their appointment to the cabinet.
You know what the private business sector is a real-life business, not a
government job. Here are the percentages.
T. Roosevelt.................... 38%
Taft.................................. 40%
Wilson ........................... 52%
Harding........................... 49%
Coolidge......................... 48%
Hoover............................ 42%
F. Roosevelt................... 50%
Truman........................... 50%
Eisenhower................ .... 57%
Kennedy......................... 30%
Johnson.......................... 47%
Nixon.............................. 53%
Ford................................ 42%
Carter............................. 32%
Reagan........................... 56%
GH Bush......................... 51%
Clinton .......................... 39%
GW Bush........................ 55%
Obama..................... 8%

This helps to explain the incompetence of this administration:
only 8% of them have ever worked in private business!

That's right! Only eight percent---the least, by far, of the
last 19 presidents! And these people are trying to tell our big
corporations how to run their business?

How can the president of a major nation and society, the one
with the most successful economic system in world history, stand and talk
about business when he's never worked for one? Or about jobs when he has
never really had one? And when it's the same for 92% of his senior staff
and closest advisers? They've spent most of their time in academia,
government and/or non-profit jobs or as "community organizers." They should
have been in an employment line.