Year Percent 2001 -0.07055 2002 -0.06329 2003 -0.06019 2004 -0.05432 2005 -0.05228 2006 -0.04621 2007 -0.04089 2008 5.5721 2009 6.46127 2010 1.43049 2011 -0.30763 2012 3.51734 2013 0.89795 2014 0.80449 2015 0.84374 2016 0.82029 2017 0.75507