Year Percent 2001 -0.24824 2002 2.40571 2003 -2.74603 2004 8.1794 2005 -5.68285 2006 7.99873 2007 0.20787 2008 0.75017 2009 -2.22032 2010 6.89872 2011 3.36347 2012 -3.12937 2013 -2.12699 2014 -1.44887 2015 -0.91895 2016 -1.28793 2017 -1.07568