While we're at it, here's...

...a long-term chart on coal mining employment in absolute terms.

From Josh Marshall:

"About a hundred years ago there were just shy of 1 million miners. It's an amazing number since at the time U. S. population was about 100 million."

"The big driver here is technology and less labor intensive production."

"Another underappreciated fact: when we talk about decline of labor movement a big big part of it was simply that those jobs disappeared."

"They weren't deunionized. And they certainly weren't shipped overseas. They just disappeared."