It's time to take a serious look at Tim Cook's leadership of Apple

On August 24, 2011, Tim Cook took over from Steve Jobs as the permanent CEO of Apple. He's been in charge ever since.

So how's he doing after five years?

Apple's earnings report for the quarter that ended on June 30 beat Wall Street's expectations, sending the stock up about 7% after-hours. Apple is still the most valuable company in the world, and earns more profit in a quarter than most other tech companies do in a year.

But at the same time, Apple's revenue has started shrinking. Its most important product, the iPhone, is shrinking. All its other business lines, save one, are shrinking. And the company hasn't had a new hit product since Cook took over.

Let's go to the charts: