% Eu% Ca% so 50 40 30 lib III "0 2003 2004 2005 2006 2007 2006 2009 2010 2011 2012 2013 2014 2015 2016 2017 fi r.oM••htiwNwa.Gnth NS 1410v OREM .4 II t•44••••• wv Smote ant a.n OftearovoSont U.S. ethane-based ethylene producers maintain their cost advantage vs. naphtha-based ethylene produce