Year Percent 2004 1.80872 2005 0.14645 2006 0.636 2007 0.40947 2008 0.20639 2009 -0.53076 2010 0.47261 2011 -0.02588 2012 0.34597 2013 0.47453 2014 0.05368 2015 0.58443 2016 0.0011 2017 0.52239