Year Percent 1996 -5.68842 1997 2.0237 1998 -6.50443 1999 -3.2164 2000 2.31557 2001 6.33753 2002 8.04993 2003 6.9006 2004 7.66609 2005 7.76187 2006 5.09167 2007 3.23898 2008 8.00539 2009 -5.88126 2010 7.20701 2011 6.86177 2012 -0.68697 2013 9.4293 2014 4.86392 2015 -0.33585 2016 4.56337 2017 4.56488