A damning stat. It makes no sense, as we're definitely capable of good deliveries. We often deliver a good corner, but nobody moves for it (though we do also hit the first man with a lot of them too).
Maguire is great at winning the ball in the air and scores a fair amount for England, and Ronaldo is the best header of the ball in the world. Corners are a low-percentage opportunity, but we still should be doing better.
I know short corners get a groan from the crowd, but we'd be better off just not bothering and keeping possession instead.