Created with Raphaël 2.1.2
2016*
80,000
90,000
100,000
110,000
120,000
130,000
140,000
150,000
160,000
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016*
*2016 production is forecast between 80-90 million short tons (West Virginia University).