Year Percent 1995 -0.04701 1996 0.03352 1997 0.14892 1998 -0.02486 1999 0.21022 2000 0.32101 2001 0.62514 2002 1.44927 2003 2.39044 2004 1.39715 2005 2.91441 2006 2.28877 2007 4.60602 2008 2.39578 2009 0.67576 2010 0.41606 2011 -0.02751 2012 -1.22182 2013 0.06655 2014 0.42623 2015 0.75598 2016 1.06794 2017 1.24767