"Free" market growth? The biggest factor seems to be the price of a barrel of oil.
Oh, I see. The technological development of fracking had nothing to do with it. It was a magical drop in the oil price.
Yes, a magical drop orchestrated by the Saudis to destroy said US fracking competition and be a part of some Satanic quid pro quo with the empire so as to have free reign to destroy it's neighbor, Yemen, due to growing Iranian/Shiite influence there.
I'm just curious, are these numbers inflation adjusted?