Year Percent 2001 0.15552 2002 0.66061 2003 -0.18751 2004 -0.72776 2005 0.53986 2006 4.45346 2007 1.64752 2008 4.03814 2009 -2.76303 2010 -1.07357 2011 0.87853 2012 2.25665 2013 4.24215 2014 2.37057 2015 -0.48475 2016 -0.05534 2017 1.36096