zinc price to global gdp

So from the U.S. galvanizing industry article they stated..

The U.S. Federal Reserve estimated 2012 economic growth of roughly 2.5 percent, in line with the growth estimates for the North American galvanizing industry. "Hot Dip Galvanizing is a GDP-driven industry," Pendley said.

I decided to compare global GDP growth to the zinc price since 2007. I was surprised at how closely it trends.

It's quite difficult to represent this correlation in charts meaningfully but I will try. See below.