Year Percent 2003 1.70122 2004 -3.36653 2005 -1.36167 2006 2.89567 2007 2.81981 2008 11.17476 2009 25.75488 2010 -15.4185 2011 -0.63903 2012 17.34957 2013 2.3556 2014 -0.62695 2015 1.225 2016 2.53405