Any old graphs on the drill rig counts dating back to the 1970's ? 
As with grains should we be looking at BOTH, the US and the rest of the world ? 

good site: ( http://www.wtrg.com/rotaryrigs.html )

94 myn bbls per day of world consumption.. nothing to sneeze at.

US produces 10% of that.. consumes 20%.. 

btw this is an outlook for US Crude Oil and NG production from one of the pipeline (transporters of product) EPD to it's investors..  So it looks like "people in the biz.." believe we are going lower on US production... ( http://seekingalpha.com/article/3957997-will-enterprise-products-partners-continue-outperform?ifp=0 )  A year from now could be around 8 byn bbls per day... difference will have to come from somewhere..